Some species of worms are like many plants, and are able to generate both eggs a

Question

Some species of worms are like many plants, and are able to generate both eggs and sperm, which allows the worms to self-fertilize. You are studying two genes in a species of worm that can self-fertilize. One of the genes determines skin texture and the other determines spot color. In the group of worms you’re using, inidivduals have either slimy or dry skin, and either brown or black spots. You cross a worm that is true-breeding for slimy skin and brown spots with a worm that is true-breeding for dry skin and black spots, and analyze the offspring. What observation(s) would support the hypothesis that the two genes are on the SAME chromosome?

1. all the gametes produced by the parent with slimy skin and brown spots have the slimy skin and brown spot alleles, and all the gametes produced by the parent with dry skin and black spots have the dry skin and black spot alleles 2.all the offspring are heterozygous for both genes 3.all the gametes produced by the offspring have either the slimy skin and brown spot alleles, or the dry skin and black spot alleles

Explanation / Answer

Second option is correct. All the offspring are heterozygous for both genes, because they are present on one chromosome, so genes are linked. Both the parents will have the copies. Being on a single chromosome only they can have heterozygous forms.

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