1. What is the probability of a child having widows peak and dimples if its parents are
heterozygous for both traits?

50% probability is there for a child  to have widows peak and dimples if its parents are  heterozygous for both traits.

Explanation:

Widows peak is a dominant trait on straight hair line.

Dimples are dominant traits over non dimples.

It is given that parents are heterozygous for the trait. So genotype of parents will be

WwDd  X   WwDd

The punnet square shows:

The gametes will be WD, wd, Wd,wD

           WD        Wd         wD       wd

WD   WWDD  WWDd  WwDD  WwDd

Wd  WWDd   WWdd   WwDd  Wwdd

wD  WwDD   Wwdd    wwDD  wwDd

wd  WwDd   Wwdd    wwDd   wwdd

8 progeny Will have both widow's peak and dimples. The results of the cross shows that there is 50% probability that the progeny will have both the traits when parents are heterozygous.