A Fruit Fly of Genotype A⁺/a ^{A)What Gametes Were Produced by Parent 1 and in What}

question 62

Essay

A fruit fly of genotype a⁺/a ^. b⁺/b (parent 1)is crossed to another fruit fly of genotype a/a ^. b/b (parent 2).The progeny of this cross were:
$$\begin{array} { l l } \text { Genotype } & \text { Number of individuals } \\\hline a ^ { + } / a \cdot b ^ { + }/ b & 38 \\a / a \cdot b / b & 37 \\a ^ { + } / a \cdot b / b & 12 \\a / a \cdot b ^ { + } / b & 13\end{array}$$
a)What gametes were produced by parent 1 and in what proportions?
b)Do these proportions demonstrate independent assortment of the two genes?
c)What can be deduced from these proportions?
d)Demonstrate the arrangement of the genes on the chromosomes in parents 1 and 2 using the appropriate symbols.
e)Draw a diagram or diagrams to explain the origin of the two rarest progeny genotypes.

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