A man with thick eyebrows (E, dominant trait), has a child with a woman who has thin eyebrows (e, recessive trait).

What is the probability that their children will have thick eyebrows? _________

If the man is homozygous for the trait, can this couple have children with thin eyebrows? _________

		between 50 - 100% ; no
		between 25 - 50% ; no
		between 50 - 100% ; yes
		between 25 - 50% ; yes

Answer: between 50-100%; no

1. What is the probability that their children will have thick eyebrows? 50-100%

Explanation: 

There are two possible genotypes for the man having the dominant trait. One is the dominant homozygous (EE) and the other one is Dominant heterozygous (Ee).
If the father is Dominant homozygous there is a 100% probability that their children will have thick eyebrows, and if the man has a Heterozygous Dominant genotype then there is a 50% probability that their children will have the dominant trait i.e. thick eyebrows.
The punnet squares and discussion for both the conditions are shown below-

2. If the man is homozygous for the trait, can this couple have children with thin eyebrows? no

Explanation:

 If the man is homozygous for that trait, then the genotype is "EE". Whereas the genotype of the mother is "ee". So, there is "no" probability that the couple will have children with thin eyebrows.
The punnet square and discussion is given below-

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