16. Mexican hairless dogs have little hair and few teeth. When a Mexican hairless is mated to another breed of dog, about half of the puppies are hairless. When two Mexican hairless dogs are mated to each other, about 1/3 of the surviving puppies have hair, and about 2/3 of the surviving puppies are hairless. However, about two out of eight puppies from this type of cross are born grossly deformed and do not survive. Explain this pattern of inheritance.

Here you can tell that it is heterozygous with a dominant allele to be a hairless dog, for example, Hh, where H is dominant.

When you cross one hairless (Hh) with a not hairless dog (hh), Punnett square will show chances are half hairless and half not hairless.

When you cross two hairless (Hh), Punnett square will show three cases: HH, Hh, and hh.

hh is not hairless.

Hh is hairless.

HH is a codominance in which both parents gave the hairless allele, and this may be the not surviving dogs.