13. In a species of grass, height is determined by 5 genes. Each gene has two al

Question

13. In a species of grass, height is determined by 5 genes. Each gene has two alleles, one allele contributes 2cm to plant height and the other is non-contributing (adds 0 cm to height). If a plant that is aabbccddee is 10cm tall (all alleles noncontributing) and a plant that is AABBCCDDEE is 30cm tall (all alleles contributing) a. If you cross aabbccddee x AABBCCDDEE, what will be the height of the progeny? b. If you cross the Fl from above to itself, what proportion of the F2 progeny will be 22cm tall? b. What proportion of the F2 progeny will be 10cm?

Explanation / Answer

a. all of the progeny of F1 generation will have genotype = AaBbCcDdEe

height contributing alleles = 5

so height increased = 5x2=10

so height will be = 10+10 = 20 cm

b. the proportion of progeny having 22 cm tall means, the genotype must have 6 dominant alleles. = 210

genotype 1 : 10 : 45 : 120 : 210:252:210:120: 45: 10 : 1

no. of dominant allele 10 9 8 7 6 5 4 3 2 1 0

c. 1/1024

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