What does pleiotropy mean for the effect of a single gene?
QUESTION
Which cross is a testcross for a dominant-phenotype individual of genotype A_?
QUESTION
What is the phenotypic ratio for Aa×Aa under incomplete dominance?
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ANSWER
1:2:1 (three distinct phenotypes). Incomplete dominance produces three phenotypes in the ratio due to the intermediate heterozygote differing from both homozygotes.