Two phenotypically wild-type Drosophila (with long wings and red eyes) are crossed, and two mutant phenotypes...
Two phenotypically wild-type Drosophila (with long wings and red eyes) are crossed, and two mutant phenotypes (curved wings and lozenge eyes) are seen to segregate among the progeny as follows:
Females:
900 long wing, red eyes
300 curved wing, red eyes
Males:
450 long wing, red eyes
450 long wing, lozenge eyes
150 curved wing, red eyes
150 curved wing, lozenge eyes
propose a genetic model for the two traits and determine the genotypes of the two wild-type parents
Homework Answers
Let L be the depiction for Long wings and l be the depiction for curved wings, let XR be the depiction for red eyes and Xr be the depiction for lozenge eyes.
The genotypes of parents are long wing, red eyes--LlXR Y (male parent) X Ll XRXr.( female parent).
The Punnett square model for the formation of progeny will be---
| cross | LXR | lXR | LY | lY |
| LXR | LLXRXR (long wing, red eye female) | LlXRXR( long wing,red eye female) | LLXRY(long wing, red eye male) | LlXRY(long wing, red eye male) |
| LXr | LLXRXr ( long wing, red eye female) | LlXRXr ( long wing, red eye female) | LLXrY(long wing, lozenge eye male) | LlXrY( long wing, lozenge eye male) |
| lXR | LlXRXR ( long wing, red eye female) | llXRXR ( curved wing, red eye female) | LlXRY( long wing, red eye male) | IlXRY( curved wing, red eye male) |
| lXr | LlXRXr ( long wing, red eye female) | llXRXr ( curved wing, red eye female) | LlXrY ( long wing, lozenge eye male) | llXrY( curved wing, lozenge eye male). |
Curved wing allele is autosomal recessive trait and lozenge eye allele is sex-linked recessive trait. Long wing is a dominant trait and red eye is a dominant trait in drosophila.
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