Question

genetics question

Answer 1

the answer is C but can you explain why

Answer 2

@ganeshie8 do you know?

Answer 3

They both need to be heterozygous because 1 allele from the each of parents gametes is combined. Lets say b is the allele for albino and B is the allele for normal pigmentation. Homozygous combinations would be bb or BB. Because B is dominant, the offspring needs to be homozygous bb to express the albino condition. Parents are both heterozygous Bb. When you combine Bb x Bb, 25% of the offspring would be albino. Parents can't be homozygous because they would express the condition too.

Answer 4

C says that "both parents must be heterozygous."

That means that each of the parents has this genotype: (A a)

In order to be an albino, you would need to have this genotype: (a a).

The child got one lowercase ( a) from his dad,
and one lowercase ( a ) from his mom.

Because of this, the child has this genotype: (a a).

And that means he's an albino child.

Answer 5

@thomaster thank you so much! i understand