Question

Identify the genotype for each numbered item.
1.
2.
3.

Answer 1

I don’t have the problem details — the phenotypes, crosses, images or offspring ratios — so I can’t pick genotypes for 1–3 yet. Could you paste the full question or upload the image?

If it helps, here are quick rules you can use (and paste your data into):

- If a phenotype is recessive, genotype = homozygous recessive (aa).
- If a phenotype is dominant, genotype = either homozygous dominant (AA) or heterozygous (Aa). Distinguish these by a test cross: cross the individual to a homozygous recessive (aa).
- If any offspring show the recessive phenotype → parent was Aa.
- If all offspring show the dominant phenotype → parent was likely AA (assuming enough offspring to be confident).
- If two parents with the dominant phenotype produce 25% recessive offspring → both parents are Aa (Aa × Aa gives 3:1).
- If two parents produce 100% dominant and one parent is known AA, the other could be AA or Aa; if one parent is aa and offspring are 100% dominant, the other parent must be AA.
- For incomplete dominance: heterozygote shows intermediate phenotype (genotypes are distinguishable by phenotype: RR, Rr, rr).
- For codominance: heterozygote shows both traits (genotypes likewise distinguishable).
- For sex-linked traits: remember males are hemizygous (X-linked traits show in males with only one allele).

If you paste the three numbered items (phenotypes, parental genotypes, or offspring ratios), I’ll identify the genotypes for 1–3.