The allele responsible foe 2:1 ratio when two yellow snapdragons are crossed is Lethal allele.
Edwin Baur began working with the snapdragon plant Antirrhinum in 1907 and identified the condition aurea, in which plants possessed golden rather than green leaves.
Baur discovered a 2:1 ratio of green seedlings to yellow seedlings when two aurea snapdragon plants were crossed. Homozygous aurea plants did not grow normal chlorophyll and perished at the embryonic stage or when the plant seedlings were two to three days old.
In other words, the homozygous aurea plants, like Cuénot's homozygous mice, were unable to properly grow, and as a result, an entire class of progeny died.
Because they changed Mendelian inheritance ratios, Cuénot and Baur found the first recessive deadly genes. Recessive lethal genes can code for either dominant or recessive features, but they do not induce death unless two copies of the deadly allele are present in an organism.
Cystic fibrosis, sickle cell anemia, and achondroplasia are examples of human illnesses caused by recessive lethal genes. Achondroplasia is a dwarfism-causing autosomal dominant bone condition. While inheriting one achondroplasia allele can produce the condition, inheriting two recessive lethal alleles is deadly.
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How do sensory nerves differ in function from motor nerves?
A. The CNS controls sensory nerves and the PNS controls motor nerves.
B. Sensory nerves carry information to the CNS, and the motor nerves carry information away from the CNS.
C. Sensory nerves carry information away from CNS, and motor nerves carry information to the CNS.
D. The PNS controls the sensory nerves and the CNS controls motor nerves.
please help!!!
Answer:
B.
Explanation:
When you touch something the sensory nerves carry it to the brain while your motor nerves tell you to touch it. So being carried to and from. I also got it right on the quiz.
Sensory nerves carry information to the CNS, and the motor nerves carry information away from the CNS. Therefore, the correct statement is option B.
What is central nervous system?The central nervous system (CNS) includes the brain and the spinal cord responsible for processing information received from peripheral nervous system (PNS) to generate appropriate responses. The brain is the most complex organ of the CNS, carries various functions, including sensation, perception, movement, etc.
Sensory nerves transmit information from sensory receptors, such as those in the skin, muscles, etc. to central nervous system (CNS) and sensory nerves are activated by various types of stimuli.
Motor nerves transmit signals from the CNS to muscles, and other effectors throughout the body. These signals are responsible for activation of muscle contractions, produce movements, and other responses.
Therefore, sensory and motor nerves both work together to perform physiological functions where sensory nerves carry information to the CNS, and the motor nerves carry information away from the CNS.
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How would you describe symmetry in invertebrates?
Answer:
Invertebrates can have bilateral or radial symmetry, or they can be asymmetrical. Bilateral symmetry means that the animal is arranged in the same way on both sides. Radial symmetry means the body parts are arranged in a circle around a central point.
question 1
People try to conserve some resources, like fossil fuels, because they are not replaceable. Why can’t these resources be replaced?
A: They must be transported long distances
B: Processes that make them take a long time
C: No one can afford to buy more of them
D: It is impossible to extract more from the earth
question 2
People move into and begin living in an area that previously had no human activity. What will most likely be the effect on the amount of water?
A: Water will be more evenly distributed in the area
B: Most of the fresh water in the area will be converted to salt water
C: The amount of fresh water suitable for drinking will increase
D: There will be less available for other living things
Answer:
question 1 a
question 2 a
Use the word box below to label the main features of a cladogram.
Answer:
Explanation:
number 4 is node
In the given cladogram the number 4 is node.
What is Cladogram?A phylogeny, or hypothetical link between groups of creatures, is depicted in a diagram known as a cladogram. A phylogenetic systematics researcher will use a cladogram to depict the groups of organisms being compared, their relationships, and their most recent shared ancestors.
A cladogram might be quite complicated and compare every known form of life, or it can be extremely simple and compare just two or three groups of creatures.
Cladogram design is straightforward but ubiquitous. The creatures being examined, lines, and nodes where those lines intersect make up a cladogram.
Therefore, In the given cladogram the number 4 is node.
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If the statement is true, write true. If it is false,
change the underlined word or words to make
the statement true.
6. Cells were discovered using electron
microscopes.
7. Ribosomes produce proteins.
8. The cells of plants and animals lack nuclei.
9. Both DNA and RNA are proteins.
10. The cell membrane is selectively permeable.
ter of
Answer:
6.True
7.True
8.True
9. False, both RNA and DNA are nuclei acids. that are made from nucleotides
10. True
Explanation:
Answer:
6. False- light microspcopes
7. True
8. True
9. False- Nucleic Acids
10. True
WORD BANK: Carbon Dioxide, Glucose, Sunlight(Energy), Oxygen, Water, ATP(Energy)
Answer:
1. carbon dioxide
2.atp
3. oxygen
4. glucose
Explanation:
why is global warming dangerous?
Answer:
Since the Industrial Revolution, the global annual temperature has increased in total by a little more than 1 degree Celsius, or about 2 degrees Fahrenheit. Between 1880—the year that accurate recordkeeping began—and 1980, it rose on average by 0.07 degrees Celsius (0.13 degrees Fahrenheit) every 10 years. Since 1981, however, the rate of increase has more than doubled: For the last 40 years, we’ve seen the global annual temperature rise by 0.18 degrees Celsius, or 0.32 degrees Fahrenheit, per decade.
Explanation:
Answer:
The changing environment is expected to cause more heat stress, an increase in waterborne diseases, poor air quality, and diseases transmitted by insects and rodents. Extreme weather events can compound many of these health threats. Unless you wanted any of that to happen you need to care about saving the planet however you can.
Explanation:
.
Greenhouse gases
are only produced naturally
trap ozone at Earth’s surface
keep Earth cool
absorb heat from the sun
Answer:
absorb heat from the sun
Explanation:
Greenhouse gases are specific type of gases that possess the ability to trap and emit heat/thermal energy in the atmosphere. They are able to do this because of their structure. Examples of greenhouse gases are carbon dioxide (CO2), methane (CH4), chlorofluorocarbon (CFC) etc and are mostly produced via anthropogenic activities.
Greenhouse gases are therefore, produced both artificially (by burning fossil fuels) and naturally and functions to absorb heat from the atmospheric surroundings.
Answer:
absorb heat from the sun
Explanation:
Greenhouse gases absorb heat from the sun.
As a glacier moves across the land, it pushes soil and rocks in front of it and to the sides of it. What are the hills resulting from this soil called?
Answer: They are called Moraines
Explanation: A glacier is a large body of ice originating from land that constantly moves slowly over land. It occurs in almost all parts of the world and makes up about 3/4 of fresh water all over the world.
Glaciers constantly move on land and they do this under their own weight.
As a glacier moves across land, it pushes soil and rocks in front of it and to the sides of it.
The resulting hill formed as a result of this soil movement is called a Moraine.
A moraine is sometimes referred to as a glacial till. It is an accumulation of materials (usually soil and rock) left behind by a moving glacier.
Why might parasitic roots have developed in plants like the mistletoe?
Answer:Mistletoe is a parasite – it steals water and nutrients from trees. Technically, it is a “hemiparasite”, which means that it can generate some of its own resources through photosynthesis – it just needs that energetic kick from the sun to fuel the biological siege and subsequent invasion of the tree
Explanation:
Please help will give brainliest
Answer: autotrophs or primary producers, heterotrophs or consumers
What process is happening to this population of rabbits? (The answer is NOT natural selection. What is natural selection causing to happen?)
Which of the following describes a function of the endoplasmic reticulum within a cell?
how are biodiversity and the cycling of matter related to maintaining ecosystem services
Many key ecosystem services provided by biodiversity, such as nutrient cycling, carbon sequestration, pest regulation and pollination, sustain agricultural productivity. Promoting the healthy functioning of ecosystems ensures the resilience of agriculture as it intensifies to meet growing demands for food production.
Gobar gas is more beneficial in rural areas of nepal. Give two reasons
1- they can be used as domestic fuel for cooking instead of kerosene or firewood that contribute to pollution
2-they can also used to generate electricity in rural areas as these areas has not enough resources of electricity
Which ACTN3 genotype (RR, RX, or XX) would provide these Olympic marathon athletes with an advantage, and why?
Answer:
XX
Explanation:
ACTN3 genotype i.e. XX provides advantage to the Olympic marathon athletes because it strengthens the fiber of the muscles. This gene is also called the gene of speed. This ACTN3 gene has a great influence on the type of fiber that makes body muscles, and they are also linked to strength and endurance so we can conclude that this gene provides benefits to the Olympic marathon athletes by giving strength to the fiber of muscles.
ACTN3 genotype is the gene encoding for the actinin of the skeletal muscle fibres. XX of the ACTN3 genotype will be advantageous for marathon athletes.
What is ACTN3 genotype and XX?ACTN3 genotype is the gene encoding for the protein of the skeletal muscles fibres that are associated with muscular performance. This protein is expressed in the myofibers with a high twitching ability and result in a high-velocity force.
The XX genotype provides strength to the muscles and is the gene coding for the proteins that give speed. They are also responsible for endurance and are beneficial for athletes.
Therefore, XX of the ACTN3 genotype is advantageous for athletes.
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Please read careful and answer it and I will mark you
Answer:
The answer is a
Explanation:
the answer is a because as u add more ice to the icewater the water gradually increases in cold temputere and decrease in hot temperature.
It is NOT possible for two hybrid black rabbits (both Bb) to produce a white rabbit.
A) true
B) false
Answer:
false
Explanation:
Which body system produces movement by contracting and relaxing?
Integumentary system
Muscular system
Skeletal system
Synovial joint system
How do the sun and moon affect the tides?
Answer:
The Sun causes tides just like the Moon does, although they are somewhat smaller. When the earth, Moon, and Sun line up—which happens at times of full Moon or new Moon—the lunar and solar tides reinforce each other, leading to more extreme tides, called spring tides.
Please help!
10 points, it’s quick!
I will appreciate it
Question is:
Does friction affect the motion of an object and why?
Pepsin, trypsin and chymotrypsin are substances that affect reaction rates, those can be defined as
Answer: Enzymes
Explanation:
Enzymes are those proteins which participate in a chemical reaction without being consumed in the reaction. These enzymes work as a catalyst which speed up the rate of the chemical reaction. The enzyme is responsible for converting the substrate into a product. Pepsin is an enzyme present in the stomach it is activated by hydrochloric acid it is a peptic enzyme which converts proteins into peptones, trypsin and chymotrypsin are the enzymes secreted by the pancreas and it is responsible for digestion of proteins.
Question 10 of 29
Which of the following contains kinetic energy?
A. Wind
B. Moonbeams
C. Sunlight
D. Vegetables
Answer:
Both wind and sunlight have Kinetic Energy
Explanation:
If you can only choose one answer, the most obvious one would be wind
What is the phenotype of the sons in generation III? How do you know? amobia sisters
Which of the following treatment options do NOT apply to people suffering from sickle cell anemia?
Vitamin supplement
Blood transfusions
take penicillin
breathing treats that add moisture and medicine to the lungs
Answer:
breathing treats that add moisture and medicine to the lungs
Explanation:
What is metabolism?
the process of cell specialization
the process of turning glucose into energy
the process of cell division
the source of energy for the body
Answer:
metabolism is the process by which your body converts what you eat and drink into energy.
OR
Metabolism is the chemical reaction in body cells that change food into energy.
specific proteins in the body control the chemical reactions of Metabolism.
Using information from the cladogram and the data table shown below, which of the following best describes the evolutionary history of gorillas?
They are more closely related to salamanders than they are to lizards.
They evolved into a separate species as a result of bipedal motion.
They have jaws, lungs, hair, an amniotic membrane, and a tail but lack bipedal motion.
They share a more recent common evolutionary ancestor with leopards than they do with lizards.
Answer:
Several differences allow the human to walk erect on two legs with a striding gait rather than move in a knuckle-walking fashion like the gorilla. In the pelvis these differences include ...
How could wetland restoration affect humans who live in the area? How might it affect native wildlife? (Consider both positive and negative consequences.)
Answer:
the answer is c
i did this test before in 8 grade
help.............................
Answer:
1. A low- pressure weather system can cause a thunderstorm to develop.
2.Thunder is caused by lightning. When a lightning bolt travels from the cloud to the ground it creates a channel. Once the light is gone the air collapses back in and creates a sound wave that we hear as thunder.
3. One condition that is necessary for a thunderstorm include warm air and moisture.
4. The dangers of a blizzard include getting lost in the snow and freezing to death.
5. In my opinion, a hurricane would be the most difficult storm to face because hurricanes can severely impact your life due to their damage. For example,winds can damage houses, trees, and any other property. Even if your home is safe, flooding aftermath can occur. When homes are destroyed, people may have to rebuild homes and towns.
Eris is a dwarf planet in our solar system that is located beyond Pluto. Based on this fact, what can you conclude about Eris? Select the 2 (TWO) that
apply.
Eris would have a larger orbit and would take a longer time to travel round the Sun than Pluto.
Eris would be very cold.
Eris would rotate on its axis faster than Pluto
Eris would have many moons.
Answer:
hi
Explanation:
i think so...
Eris would have a larger orbit and would take a longer time to travel round the Sun than Pluto.
Eris would be very cold.
have a nice day
Answer:
Eris would have a larger orbit and would take a longer time to travel round the sun than Pluto.
Eris would be very cold
Explanation:
hope this helps