You are studying a plieotrophic gene in dogs. One trait governed by this gene is
ID: 195810 • Letter: Y
Question
You are studying a plieotrophic gene in dogs. One trait governed by this gene is tail length. For this trait the T allele is associated with normal length tails and the t allele is associated with short tails. The other trait governed by T/t is viability. In this case, T is associated with normal growth and development; whereas t is associated with embryonic loss of viability. In both cases T is completely dominant to t. You cross two dogs that are Tt heterozygotes. What ratio of offspring do you expect to see as a result of this cross?
3 dogs with short tails : 1 dog with normal tail
2 dogs with normal tails : 1 dog with short tail
3 dogs with normal tails : 1 dog with short tail
2 dogs with short tails : 1 dog with normal tail
None of the above
Explanation / Answer
Answer:
2 dogs with normal tails : 1 dog with short tail
Explanation:
In this TT condition is lethal.
Tt (normal tail length) x Tt (normal tail length) -----Parents
Normal tails : Short tail = 2 : 1
T t T TT (non-viable) Tt (normal tail-length) t Tt (normal tail-length) tt (short tail)Related Questions
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