Suppose you discover a new species of worm that exists in two forms-slimy and non-slimy.You find that mating slimy females with non-slimy males produces offspring consisting of slimy males and non-slimy females,whereas mating non-slimy females with slimy males produces offspring of both sexes that are all slimy.You would conclude that the _________ allele is dominant and that ________ are the heterogametic sex (the sex with two different sex chromosomes)in this species of worm.
A) slimy;females
B) slimy;males
C) non-slimy;females
D) non-slimy;males
E) impossible to determine without further information

Question

Quizplus · Accepted Answer

The fact that mating slimy females with non-slimy males produces offspring with a slimy phenotype indicates that the slimy allele is dominant, as all the offspring have the slimy phenotype. Additionally, the fact that mating non-slimy females with slimy males produces offspring that are all slimy indicates that the slimy allele is present on the sex chromosome, and that females are the heterogametic sex (as the offspring of non-slimy females and slimy males are all of the same sex and have the slimy phenotype). This means that the slimy allele is on the X chromosome, and that males are XY and females are XX.

Suppose You Discover a New Species of Worm That Exists