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Nitella [24]
3 years ago
8

A hornless bull is crossed with three cows, A, B, and C. Cow A is horned and produces calf A’, which is also horned. Cow B is ho

rnless and produces calf B’, which is horned. Cow C is horned and produces calf C’, which is hornless. Which is the dominant trait? Explain your reasoning. Give the genotypes of all seven animals.
Biology
1 answer:
lukranit [14]3 years ago
5 0
The dominant trait is hornless. 

If this is correct, then the original bull is a heterozygote:
H = hornless
h = horned
Bull is Hh

Cross 1: Hh x hh (horned female) - offspring is hh (horned)

Cross 2: Hh x Hh (hornless female) - offspring is hh (horned)

Cross 3: Hh x hh (horned female) - offspring is Hh (hornless)

Cross 3 is the key to confirming this because the only way to get a hornless offspring would be if hornless is recessive.


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Clonal selection identifies a __ lymphocyte that needs to be cloned for production of a specific antibody. 1. T 2. B 3. Both 4.
vovangra [49]

Clonal selection identifies a __ lymphocyte that needs to be cloned for production of a specific antibody.

is B.

8 0
3 years ago
Suppose the fictional condition lycanthropy is an autosomal dominant disorder that causes an affected person to have a strong ph
hodyreva [135]

Answer:

Sperm undergo more mitotic cellular divisions than egg and therefore have a higher risk of developing a spontaneous mutation.  

Explanation:

As you have seen in the question above, lycanthropy is a mutation that is more likely to be established as the supply of male gametes comes from older men. This is because sperm undergo more mitotic cell divisions than eggs, and therefore are at greater risk of developing a spontaneous mutation.

In order for you to understand this, you need to know that eggs (which are female gametes) are produced at once in a woman's body. Thus, cell division is limited and therefore the opportunity for spontaneous mutations to occur is also limited. However, men produce sperm from adolescence to death, creating the need for countless cell divisions, which can develop genetic errors that create spontaneous mutations in gametes.

3 0
3 years ago
(40 points) Look at the diagram below. Which animals are most closely related? Which animals are least closely related? Explain
valentinak56 [21]

Answer:

The most closely related are amphibians and reptiles.

The least related are amphibians and mammals

Explanation:

Amphibians broke off from reptiles, birds, and mammals around 260 millions years ago and next up are the reptiles which broke off around 225 million years ago. So they are the most closely related


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5 0
2 years ago
Ouabain is a specific inhibitor of the active transport of sodium ions out of the cell and is therefore a valuable tool in studi
Kay [80]

Answer:

1. Part A: No

2. Part B: Yes

3: Part C : Yes

4: Part D : No

Explanation:

1) Part A: Facilitated diffusion of glucose into a muscle cell:

No; sodium ion co - transport is required for active transport of glucose but not for facilitated diffusion of glucose

2) Part B: Active transport of dietary phenylalanine across the intestinal mucosa:

Yes; co - transport of sodium ions drives the inward movement of amino acids and can only occur if sodium ions are actively pumped back out again.

3) Part C: Uptake of potassium ions by red blood cells:

Yes; uptake of potassium ions can occur only via a pump that couples the inward pumping of potassium ions to the outward pumping of sodium ions.

4) Part D: Active uptake of lactose by the bacteria in your intestine

No; active uptake of sugars and amino acids in bacteria is driven by a proton gradient.

3 0
3 years ago
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Ede4ka [16]

Answer:

Carbon dioxide from the air is used to produce food for plant growth. Carbon moves from plants to animals when animals eat the plants. Also, Carbon moves from living things to the atmosphere. Each time you exhale, you are releasing carbon dioxide gas (CO2) into the atmosphere.

The burning of fossil fuels also releases carbon dioxide into the atmosphere.

7 0
3 years ago
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