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scoray [572]
3 years ago
7

Which of the following statements is true? 1. If you don't know a law exists, it's ok to not follow it. 2. People in an experime

nt do not have a right to refuse participation. 3. Scientist must make moral decisions on controversial issues. 4. Honest mistakes do not need to be corrected because they are not made on purpose.
Biology
1 answer:
Fudgin [204]3 years ago
6 0

Answer:

4

Explanation:

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Black fur in mice (
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The answer is D) 1/2.

Let's imagine that two genes of the genotype can be analysed separately.

Black fur is determined by dominant allele B. In this case, parents Bb and BB will give offspring with only brown fur:
Parents:          Bb     x     BB 
Offspring:     BB   BB   Bb   Bb
Both homozygous (BB) and heterozygous (Bb) offspring will have black fur.

On the other hand, long tails are determined by recessive allele t. Parents Tt and tt will have 50% offspring with short tail and 50% offspring with long tail:
Parents:         Tt         x       tt
Offspring:    Tt      Tt        tt      tt
Heterozygous offspring (Tt) will have short tail, and homozygous offspring (tt) will have a long tail.

So, the offspring will definitely have black fur and will not affect the fraction of the offspring with black fur and long tails from the cross of <span>BbTt × BBtt. But, </span>there will be 2 out of 4 offspring with short tails which is 50% or 1/2. 
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