1. All offspring will be gray. 50% will be heterozygous (Bb) and 50% will be homozygous dominant (BB).
2. Genotypes: 50% Hh, 50% hh. Phenotypes: 50% with hair, 50% without hair.
3. All offspring will be tall and heterozygous (Tt).
4. a. Black is dominant. b. White is recessive. c. Both parents are heterozygous (Bb).
5. Perform a test cross by breeding the puppy with a homozygous recessive individual (ll). If any offspring have short spiked ears, the puppy is heterozygous (Ll). If all offspring have long floppy ears, the puppy is homozygous dominant (LL).
Parent Tip: Review the logic above to help your child master the concept of genetic crosses worksheet answer key.
