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23 Nov 2019

1. What genotypes of individuals must be crossed in order to get a 3:1 ratio?

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Nelly Stracke
Nelly StrackeLv2
9 Sep 2019
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Related questions

2. A purple-flowering plant (PP) is crossed to a white-flowering plant (pp).

A. Using a Punnett square, diagram the cross. What are the genotypic and phenotypic outcomes?

B. Two F1 individuals from the previous cross are crossed to each other. Draw a new Punnett square, diagramming the new outcome. What is the ratio for purple flowers to white flowers? How many genotypes are there? In what frequency to they occur?

1. A dominant gene (H) produces wire-haired texture in dogs; its recessive allele (h) produces smooth hair. Two heterozygous wire-haired individuals were crossed and their F1 progeny testcrossed. Determine the expected genotype and phenotype rations among the testcross progeny. Note: in a testcross, an individual with an unknown genotype is crossed with a homozygous recessive individual.

2. A white guinea pig, whose parents were black, is closed with a black guinea pig whose male parent was white and whose female parent was black. Two white offspring result. Determine the genotypes of all individuals mentioned. About which individuals is there some doubt?

In birds, females are the heterogametic sex (ZW) and males are homogametic (ZZ). The feather color gene in pigeons is on the Z chromosome with dominance expressed as red > blue > brown. A female from a true breeding red line is crossed with a male from a true breeding brown line to yield an F1 male. In another cross, a female from a true breeding blue line is crossed with a male from a true breeding brown line to yield an F1 female. The F1 male and F1 female are crossed. What are the genotypes of these two F1 individuals and what are the expected proportions of genotypes and phenotypes (including sex) from the resultant F2 progeny ?

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