The Height of a Type of Bean Plant Is Determined

question 35

Essay

The height of a type of bean plant is determined by five unlinked genes called A, B, C, D, and E.Each gene has two alleles: additive (uppercase letter)and nonadditive (lowercase letter).The shortest plants are 130 cm.The tallest plants are 220 cm.
a.Estimate how many centimeters each allele contributes to the height difference of 90 cm.
b.The genotypes are known for two bean plants.Plant 1 is genotype AABbccDdEE.Plant 2 is genotype aaBBCcDdEE.What are their heights?
c.If the two plants in the previous question are crossed, could they produce a plant that is taller than either parent? How?
d.All the genes are unlinked.Determine the probability of an AbcdE gamete from plant 1, and an aBcdE gamete from plant 2.What will be the genotype and phenotype of a plant from these gametes, and what is the probability of a plant with this genotype?
e.If the progeny plant from the cross in the previous question was only 60 cm because of an allele in a gene other than A-E, what genetic phenomena are at work?
f.If the progeny plant with the genotype in part (d)was a few centimeters taller than your prediction, how would you explain it?

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