13 Jun A pure breeding, doubly homozygous tall bean plant that produces beans
uestion
A pure breeding, doubly homozygous tall bean plant that produces beans with a smooth surface was crossed with a pure breeding, doubly homozygous dwarf bean plant that produces beans with a wrinkled surface.
The T allele is dominant and confers tall plants while the t allele is recessive and confers dwarf plants, while the S allele is dominant and gives smooth beans and the s allele is recessive and produces wrinkled beans. Presume also that the 2 genes are on different chromosomes and so independent assortment applies.
a) What are the genotypes of the 2 individuals involved in the parental cross?
b) What is the genotype of the F1 generation produced by the parental cross?
c) What are the genotypes and their respective frequencies of the F1 gametes?
The F1 bean plant was then test crossed with the dwarf wrinkled bean plant. The testcross progeny were then scored for phenotype.
d) What are the genotypes of the test cross progeny? Show your working.
e) If a total of 160 test cross progeny were scored, what would be the expected phenotypes of the test cross progeny and how many of each phenotype would be expected?
Explain how meiotic cell division enables
a) Halving of chromosome number
b) Genetic variation.
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