Question

In Drosophila, grey body is dominant to black, and long wings is dominant to short wings. Two unlinked pairs of alleles, G/g and L/l, cause this pair of traits respectively. Six pairs of flies of unknown genotypes are mated, giving the results listed below. Write the genotypes of the parental flies in each cross using the gene symbols above.
Types of progeny____
Cross Parents Grey Grey Black Black
Long Short Long Short
1 grey long x grey short 43 46 14 17
2 grey short x grey short 0 61 0 23
3 black long x grey long 40 0 44 0
4 grey long x grey long 48 18 0 0
5 grey short x grey long 31 33 0 0

Answer 1

Answer:

1. GgLl    x    Ggll ---> grey long x grey short
2. Ggll    x    Ggll ---> grey short x grey short
3. GgLL    x    ggLL   or   GgLL    x    ggLl ---> black long x grey long
4. GGLl    x    GGLl    or  GGLl    x    GgLl ---> grey long x grey long  
5. GGLl     x     GGll    or   GgLL    x     GGll ---> grey short x grey long

Explanation:

Due to technical problems, you will find the complete answer and explanation in the attached files

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