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19 Mar 2019
Genetics. A cross is made between two true-breeding parental strains in Drosophila. The following progeny data were obtained by scoring the males in the F2 generation:
white eyes/wildtype bodies: 6
wildtype eyes/ wildtype bodies: 492
white eyes/yellow bodies: 494
wildtype eyes/yellow bodies: 8
a) State the phenotypes of the F1 males and F1 females that produce the F2 progeny, assuming that both mutations are recessive.
b) Explain if white eyes are determined by a recessive allele of an X-linked gene.
c) Explain if wild type bodies are determined by a dominant allele of an X-linked gene.
d) Can the student conclude that the 2 genes assort independently? Explain.
e) If possible, calculate the recombination frequency for the two genes.
Genetics. A cross is made between two true-breeding parental strains in Drosophila. The following progeny data were obtained by scoring the males in the F2 generation:
white eyes/wildtype bodies: 6
wildtype eyes/ wildtype bodies: 492
white eyes/yellow bodies: 494
wildtype eyes/yellow bodies: 8
a) State the phenotypes of the F1 males and F1 females that produce the F2 progeny, assuming that both mutations are recessive.
b) Explain if white eyes are determined by a recessive allele of an X-linked gene.
c) Explain if wild type bodies are determined by a dominant allele of an X-linked gene.
d) Can the student conclude that the 2 genes assort independently? Explain.
e) If possible, calculate the recombination frequency for the two genes.
Sixta KovacekLv2
21 Mar 2019
