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The allele for a green shell (H) is dominant to the allele for a brown shell (h).

The phenotype ratio of Generation 2 for Group R is shown in the diagram.



Which genotype could be placed in both boxes in Generation 1 that would would produce the phenotypes shown in Generation 2.



(1 point)
Responses

Hh
Hh

HH
HH

hh
hh

This cannot be determined with the information provided.

1 answer

To determine which genotype could be placed in both boxes in Generation 1 that would produce the phenotypes shown in Generation 2, we need to understand the effects of the alleles provided.

The allele for a green shell (H) is dominant over the allele for a brown shell (h). This means:

  • Genotype HH would produce a green shell phenotype.
  • Genotype Hh would also produce a green shell phenotype.
  • Genotype hh would produce a brown shell phenotype.

Since we want the same genotype in both boxes of Generation 1 and we want to produce a mix of phenotypes in Generation 2, we should consider the following:

  1. If both genotypes in Generation 1 are HH, then all offspring would be HH (green shells).
  2. If both genotypes in Generation 1 are hh, then all offspring would be hh (brown shells).
  3. If both genotypes in Generation 1 are Hh, the offspring would be a 3:1 ratio of green (HH or Hh) to brown (hh), resulting in both green and brown shells.

Given that we want phenotypes showing both green and brown shells in Generation 2, the only suitable genotype for Generation 1 is Hh. This allows for the potential of producing both green and brown shell offspring.

Therefore, the correct response is: Hh