You have four colonies of mice that are independent of each other. Each has a tr

Q: You have four colonies of mice that are independent of each other. Each has a tr

one gene involved that is s-allele S=LONG TAIL ,s-small tail recessive trait ss- small tail recessive trait SS=LONG TAIL Ss---- LONGTAIL sS x SS----------RESULTS IN SHORT TAIL OFFSPRINGs ss x sS----------RESULTS IN SHORT TAIL OFFSPRINGs ss x ss----------RESULTS IN SHORT TAIL OFFSPRINGs ss x SS----------NO SHORT TAIL OFFSPRING

ID: 4824 • Letter: Y

Question

You have four colonies of mice that are independent of each other. Each has a true-breeding mutation resulting in a short tail. For each colony, the short tail phenotype is recessive to the wild-type long-tail phenotype. You do not know whether these four short tail phenotypes are due to mutations in a single gene, or due to mutations in several different genes, and you decide to find out. After performing all possible pairwise crosses of short-tailed mice among the colonies (colony 1 mouse X colony 2 mouse, etc.), you find that all crosses give you long-tailed mice with the wild-type phenotype. How many genes resulting in short tails are represented among these four colonies?

Explanation / Answer

one gene involved that is s-allele

S=LONG TAIL ,s-small tail recessive trait

ss- small tail recessive trait

SS=LONG TAIL

Ss---- LONGTAIL

sS x SS----------RESULTS IN SHORT TAIL OFFSPRINGs

ss x sS----------RESULTS IN SHORT TAIL OFFSPRINGs

ss x ss----------RESULTS IN SHORT TAIL OFFSPRINGs

ss x SS----------NO SHORT TAIL OFFSPRING

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You have four colonies of mice that are independent of each other. Each has a tr

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You have four colonies of mice that are independent of each other. Each has a tr

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