Problem: In Loch Ness Monsters, three humps is dominant to two humps, and fire-breathing ability is dominant to non-fire-breathing. I crossed a three-humped, fire-breathing monster with a two-humped, non-fire-breathing monster. All of my baby monsters were three-humped and fire-breathing.A. What were the genotypes of the mom and dad monsters.B. What are the genotypes of the babies?C. If I crossed a baby brother with a baby sister, what would the expected genotypic and phenotypic frequencies be?

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FREE Expert Solution

A. For a cross between a three-humped (H _ ), fire-breathing (F _) monster with a two-humped (hh), non-fire-breathing (ff) monster to produce progeny that all have dominant phenotypes, the three-humped, fire-breathing monsters must be homozygous dominant for both traits because having heterozygous alleles for any would produce a 1:1 dominant-recessive phenotype ratio.

The genotypes of the parents are therefore HHFF and hhff. There aren't enough information to give further distinction between the father and the mother.

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Problem Details

In Loch Ness Monsters, three humps is dominant to two humps, and fire-breathing ability is dominant to non-fire-breathing. I crossed a three-humped, fire-breathing monster with a two-humped, non-fire-breathing monster. All of my baby monsters were three-humped and fire-breathing.

A. What were the genotypes of the mom and dad monsters.

B. What are the genotypes of the babies?

C. If I crossed a baby brother with a baby sister, what would the expected genotypic and phenotypic frequencies be?