When Mating Two Heterozygotes for Alleles in Which One Is

question 22

Multiple Choice

When mating two heterozygotes for alleles in which one is dominant to the other, if the usual Mendelian segregation process is occurring, the ratio of the offspring phenotypes produced should be 3:1. The dominant phenotype would be more common than the recessive one. Imagine a situation in which two heterozygotes are mated and among their 200 offspring, 165 show the dominant phenotype while 35 show the recessive phenotype. What is the conclusion of a two-sided binomial test using the normal distribution to approximate the binomial?

• A) Fail to reject null hypothesis, we lack evidence that anything other than usual Mendelian segregation is occurring.
• B) Fail to reject null hypothesis, we have evidence that something other than usual Mendelian segregation is occurring.
• C) Reject null hypothesis, we lack evidence that anything other than usual Mendelian segregation is occurring.
• D) Reject null hypothesis, we have evidence that something other than usual Mendelian segregation is occurring.

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