Can you guys me how to answer this questions?

Answers are

Q 20

         ? = xBxb

Q 21

       Mother

Q 22

In sex linked pedigree  one gender is more effected than other But in Autosomal both Male and Female are effected equally

Q 23

       Presence of just  1 Dominant autosomal allele  is Sufficient

Q 24

      Yes, All 3 children genotype will be Hh

All should be shaded because all are effected due to Presence of H

they are known to reach a speed of 21 miles per hour

yes, because even though a theory has a  lot of evidence to support it, it is not always true