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Answer all 3 parts of the question. a) In radishes, the plants can be tall (allele...

Answer all 3 parts of the question.

a) In radishes, the plants can be tall (allele T) or dwarf (allele t). Tall is dominant. Root color can be red (allele RR), white (allele RW), or pink (heterozygote). A radish that is true-breeding for both red roots and tallness (RRRR TT) is crossed with a radish that is true-breeding for both white roots and being dwarf (RWRW tt). Write the genotype and phenotype for the F1 generation.

b) Assume the two genes for plant height and root color are on separate chromosomes. Two plants from the F1 generation are crossed with each other to produce the F2 generation. Use a Punnett square to show the dihybrid cross and the genotypes of the F2 generation. What will be the phenotypic ratio for the F2 generation?

c) Assume the two genes for plant height and root color are on the same chromosome. Assume there is no crossing over. Two plants from the F1 generation are crossed with each other to produce the F2 generation. Use a Punnett square to show the dihybrid cross and the potential genotypes for the F2 generation. What will be the phenotypic ratio for the F2 generation?
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Answer #1

Parent 1 = RR/RR T/T
Parent 2 = RW/RW t/t

Parental cross: RR/RR TT X RW/RW tt
F1 progeny: RR/RW Tt
Phenotype = Pink and tall

F1 selfing: RR/RW Tt X RR/RW Tt
F2 progeny:
Phenotypic ratio = 3:6:3:1:2:1
Tall red = 3
Tall pink = 6
Tall white = 3
Dwarf red = 1
Dwarf pink = 2
Dwarf white = 1

See image for the punnet square

Assuming complete linkage,
F1 selfing: RR/RW Tt X RR/RW Tt
Gametes: RRT RWt X RRT RWt
F2 progeny:
RRRRTT = Red tall
RRRWTt = Pink tall
RRRWTt = Pink tall
RWRWtt = White dwarf
Phenotypic ratio = 1:2:1

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