The following four crosses all apply to diploid organisms. Assume that all the p
ID: 39987 • Letter: T
Question
The following four crosses all apply to diploid organisms. Assume that all the parents are true breeding. You are given the phenotypes of the parental generation and the phenotypic ratio of the F2 generation. You must supply the following information:
1) genotypes of the parents
2) the phenotypic ratio expected for a testcross of the F1
Define your symbols. (8 points)
a) P cross: Red x Brown
F2 Phenotype Ratios: 9 red-brown
3 red
3 brown
1 white
1a) Parental Genotypes:
2a) Phenotypic ratio expected for a testcross of the F1 :
b) P cross: Red x Tall
F2 Phenotype Ratios: 1 red, tall
2 red, intermediate
2 pink, tall
4 pink,intermediate
2 pink, short
1 white, tall
2 white, intermediate
1 white short
1b) Parental Genotypes:
2b) Phenotypic ratio expected for a testcross of the F1 :
c) P cross: albino 1 x albino 2
F2 Phenotype Ratios: 9 wild type
7 albino
1c) Parental Genotypes:
2c) Phenotypic ratio expected for a testcross of the F1 :
1) genotypes of the parents
2) the phenotypic ratio expected for a testcross of the F1
Explanation / Answer
1a) Parental Genotypes: RRbb (RED) and rrBB (BROWN)
2a) Phenotypic ratio expected for a testcross of the F1 :- 1 Red-Brown and 1 Brown
1b) Parental Genotypes: RRTT (RED, TALL), rrtt (WHITE, SHORT)
2b) Phenotypic ratio expected for a testcross of the F1 :- 1:1:1:1 (Pink intermediate, Pink short, White intermediate, white short)
1c) Parental Genotypes: WWaa (ALBINO1) and wwAA (ALBINO2)
2c) Phenotypic ratio expected for a testcross of the F1 :- 1:1 (Wild type, albino)
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