Two fruit bats are crossed in a captive breeding program. It is a testcross invo

Question

Two fruit bats are crossed in a captive breeding program. It is a testcross involving three loci that control for different traits: Fur color (Ff = purple, ff = blue), Ear size (Ll = large, ll = small), and Fruit Preference (Aa = avocados, aa = mangos). The phenotypes and numbers of offspring in each category are shown below.

a.Which alleles were on each chromosome in the heterozygous parent?

Phenotype

Genotype

# of Offspring

Class

Purple, large, avocado-loving

Ff, Ll, Aa

1

Double crossover

Purple, large, mango-loving

Ff, Ll, aa

558

Parental

Purple, small, avocado-loving

Ff, ll, Aa

56

Single crossover

Purple, small, mango-loving

Ff, ll, aa

70

Single crossover

Blue, large, avocado-loving

ff, Ll, Aa

62

Single crossover

Blue, large, mango-loving

ff, Ll, aa

53

Single crossover

Blue, small, avocado-loving

ff, ll, Aa

497

parental

Blue, small, mango-loving

ff, ll, aa

3

Double crossover

Phenotype

Genotype

# of Offspring

Class

Purple, large, avocado-loving

Ff, Ll, Aa

1

Double crossover

Purple, large, mango-loving

Ff, Ll, aa

558

Parental

Purple, small, avocado-loving

Ff, ll, Aa

56

Single crossover

Purple, small, mango-loving

Ff, ll, aa

70

Single crossover

Blue, large, avocado-loving

ff, Ll, Aa

62

Single crossover

Blue, large, mango-loving

ff, Ll, aa

53

Single crossover

Blue, small, avocado-loving

ff, ll, Aa

497

parental

Blue, small, mango-loving

ff, ll, aa

3

Double crossover

Explanation / Answer

Purple, large, mango-loving ----> Ff, Ll, aa ----> Parental (so, it contains F, f, L, l and a alleles on its chromosome)

Blue, small, avocado-loving ---> ff, ll, Aa ---> Parental (it contains, f, l, A and a alleles on its chromosome)

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