Questions

1. What genotypes and phenotypes would you expect in offspring from a mating of two horses
   with the genotypes AABB and aabb?
2. Would you expect the bay phenotype in offspring from a mating of two horses that each
   have the genotype Aabb? Explain.
   What genotypes and phenotypes would you expect in offspring from this mating in

Question 1:

1. Identify the Parent Genotypes:
   • Parent 1: AABB
   • Parent 2: aabb
2. Determine the Gametes:
   • Parent 1 can produce gametes: AB
   • Parent 2 can produce gametes: ab
3. Punnett Square:
   We can set up a Punnett square to determine the offspring genotypes.

   	AB
   ab	AaBb

4. Offspring Genotypes:
   • The only genotype from this cross is AaBb.
5. Offspring Phenotypes:
   • Since A and B are dominant alleles, the phenotype will be determined by the presence of at least one dominant allele for each trait.
   • Therefore, the phenotype will be a combination of the dominant traits, which we can assume to be a specific color or characteristic (e.g., bay).

• Genotype: AaBb
• Phenotype: Bay (assuming A and B represent the alleles for the bay color).

Question 2:

1. Identify the Parent Genotypes:
   • Parent 1: Aabb
   • Parent 2: Aabb
2. Determine the Gametes:
   • Each parent can produce the following gametes:
     • Parent 1: Ab, ab
     • Parent 2: Ab, ab
3. Punnett Square:
   We can set up a Punnett square to determine the offspring genotypes.

   	Ab	ab
   Ab	AABB	AAbb
   ab	AaBb	Aabb

4. Offspring Genotypes:
   • The possible genotypes from this cross are:
     • AABB
     • AAbb
     • AaBb
     • Aabb
5. Offspring Phenotypes:
   • AABB and AAbb will exhibit the bay phenotype.
   • AaBb will also exhibit the bay phenotype.
   • Aabb will exhibit a different phenotype (assuming ‘bb’ represents a different color).

• Genotypes: AABB, AAbb, AaBb, Aabb
• Phenotypes: Bay (for AABB, AAbb, AaBb) and a different phenotype (for Aabb).

Summary:

1. From the mating of AABB and aabb, the expected offspring genotype is AaBb, and the phenotype is bay.
2. From the mating of Aabb and Aabb, the expected offspring genotypes are AABB, AAbb, AaBb, and Aabb, with the bay phenotype expected in AABB, AAbb, and AaBb.