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Title: explain this mystical creature genetic cross. . .? Post by: rjframe on Sep 7, 2012 A mystical creature is diploid and exists in 2 distinct phenotypes for their wing color. Light wings result from a recessive (d) allele of a single locus. A dark wind is produced by the presence of the dominant (D) allele of a single locus.
A pure breeding light-winged male is crossed with a pure breeding dark-winged female. Their offspring consisted of all light-winged females AND all dark winged males. How could this be and show parental and progeny genotypes and proportions. Title: explain this mystical creature genetic cross. . .? Post by: ilikepoop on Sep 7, 2012 Sex linked trait where females are the hemizygotic sex.
Title: explain this mystical creature genetic cross. . .? Post by: rkkovach on Sep 7, 2012 Well, since they mention the sex of the offspring, I am going to assume we are talking about sex-linked recessive traits. So these are the parental genotypes:
light winged male means he has just the recessive gene on his one X chromosome Dark wing female is a carrier because she must pass on the recessive gene to the next generation to be light-winged. So: Parents phenotype unaffected female x affected male Parents genotype XDXd V XdY Gametes Xd and XD Xd only Genotypes of offspring XdXd XDXd XDY XdXd is the light winged female phenotype and XDY - dark winged male |