Widow’s peak is dominant over a straight hair line.if a child has widow’s peak,

Question

Widow’s peak is dominant over a straight hair line.if a child has widow’s peak, what can you say about genotypes and phenotypes of the parents?

Having freckles is dominant over lacking freckles. If a man and woman both lack freckles, what are the chances that their children have freckles?
If you have blood type B, could you have a parent with blood type A? How about blood type AB?
Please explain answers. I would like to understand the process of figuring these questions out ror tne next two questions, as?ume no new mutations: 11. Widow's peak is dominant over a straight hair lirld. If a child has widow's peak, what can you say about the genotypes and phenotypes of the parents? 12. Having freckles is dominant over lacking freckles. If a man and a woman both lack freckles, what are the chances that their children have freckles? 13. If you have blood type B, could you have a parent with blood type A? How about blood type AB?

Explanation / Answer

Answere :

Question 11 : Assuming Widow's peak is represented by allele W and straigh line is represented by w.

If a child has widow's peak i.e either have WW or Ww genotype, then parent is either :

1. Both parents have homozygous dominant widow's peak genotype i.e WW.

2. One of the parent have Widow's peak having WW genotype and other have straight hair line phenotype with ww genotype.

Question 12 : Assuming freckles is represented by F allele and lacking freckle is represented by f allele.

If both parent lack freckle phenotype (i.e they have "ff" genotype) then there is no chances to have freckles child.

Question 13 :

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