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If a homozygous black guinea pig (BB) is crossed with a homozygous white
guinea pig (bb), what is the probability that the offspring will have black fur? *
A 25%
B 50%
C 75%
D 100% ​

Respuesta :

Answer:

D. 100%

Explanation:

You can make a punnett square to help you. When you cross BB and bb, the only genotypes that result are Bb. Because the dominant trait will mask the recessive trait, all of the offspring will have black fur, thus, the answer is

D. 100%

If a homo-zygous black guinea pig (BB) is crossed with a homo-zygous white guinea pig (bb), then the probability that the offspring will have black fur is 100%.

  • A homo-zygous individual is one organism having two equal alleles of a gene, whereas a heterozygous individual is one organism having two different alleles of a gene.

  • A monogenic dominant trait is a phenotypic feature that is expressed in heterozygous individuals for that gene.

  • In this case,  black fur is a dominant trait that masks the expression of the recessive white fur trait.

In conclusion, if a homo-zygous black guinea pig (BB) is crossed with a homo-zygous white guinea pig (bb), then the probability that the offspring will have black fur is 100%. (Option D).

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