When Two Heterozygotes Are Mated, the Ratios of the Offspring

question 21

Multiple Choice

When two heterozygotes are mated, the ratios of the offspring produced should be in a 1:2:1 ratio if normal Mendelian segregation is occurring. If one of the alleles is dominant, then the phenotypes observed should be present in a 3:1 ratio with the dominant phenotype more common than the recessive one. We can use an ?² goodness-of-fit test to test whether the ratio of offspring is indeed 3:1. Imagine a cross is performed and the number of offspring observed are 67 with the dominant phenotype and 33 with the recessive phenotype. Using the table of critical values shown, what is the conclusion of our test?
?
$\begin{array}{c}\chi^{2} \text { critical values }\\\text { for } d f=2\\\begin{array}{ll}\text { Sig. level } & \text { Value } \\\hline 0.05 & 3.84 \\0.025 & 5.02 \\0.01 & 6.63\end{array}\end{array}$

• A) We fail to reject the null hypothesis and therefore conclude that something other than usual Mendelian segregation is occurring.
• B) We fail to reject the null hypothesis and therefore conclude that usual Mendelian segregation is occurring.
• C) We reject the null hypothesis and therefore conclude that something other than usual Mendelian segregation is occurring.
• D) We reject the null hypothesis and therefore conclude that usual Mendelian segregation is occurring.

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