GENETIC QUESTION 5) Several genes that influence the size of the Drosophila wing

Question

GENETIC QUESTION

5) Several genes that influence the size of the Drosophila wing were investigated to try to determine their genetic relationship, including yorkie (yki), warts (wts), fat (ft) and dachs (d). The wild-type allele of each gene is dominant and obviously is required to regulate growth to get a normal sized wing. Homozygous mutants in these genes have either a larger wing or a smaller wing than wild-type. Genotype (homozygous mutant for one or more genes, all other genes are wild-type) Size of wing yki yki wts wts ft ft small large large small small small large small yki yki; wts wts yki yki; ftt wts wts; dd ft ft, d d Below are four possible genetic pathways, identify the one consistent with the data in the table. (4 points total) Yki Wts Ft Wts Wts Yki Wts Yki Ft Ft Yki wing growth wing wing growth wing growth growth

Explanation / Answer

Answer : option B line

Reason : We can see above that the Yki is a dominant gene for small wings, and ft is a dominant gene for large wings. The line B displays the wing growth due to the progress from Yki to the ft which is a gene for large wings.

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