Question

(5 pts.) woodrats are medium sized rodents with lots of interesting behaviors. you may know of them as packrats. let's assume that the trait of bringing home shiny objects (h) is dominant to the trait of carrying home only dull objects (h). suppose two heterozygous individuals are crossed a: hh 1 b: hh 2 c: hh 1 what will be the genotypic ratio of the offspring?

Answer 1

the genotypic ratio of the offspring will be 3:1 for bringing home shiny objects versus dull objects respectively.

Step-by-step explanation:

Denoting:

H as dominant trait

h as recessive trait

Heterozygous means that the alleles are different on the gene for a specific trait. In this case, both parents have the traits of bringing home both shiny and dull objects but since bringing home shiny objects is the dominant trait, it is the only trait that they would act on.

parental phenotype: shiny objects 》 shiny objects

parental genotype: Hh 》 Hh

Parental gametes: (H) (h) 》 (H) (h)

random fertilization: punnet square

H h

H HH Hh

h Hh hh

F1 generation phenotype: shiny objects 》dull objects

F1 generation genotype: HH, Hh, Hh 》 hh

offspring ratio: 3 : 1

percentage: 75% shiny objects 》 25% dull objects