In guinea pigs, black coat (B) is dominant over albino (b), and rough skin (R) is dominant over smooth (r). A black and rough guinea pig is crossed with an albino and rough and produces the following progeny: 13 black rough, 16 albinos rough, 6 black and smooth, and 5 albinos smooth. According to these observed phenotypic frequencies, the genotypes of the parent with black coat and rough skin must be
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and the parent with albino coat and rough skin must be
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. Therefore, the expected frequencies in the offspring should be:
Black coat and rough skin is
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Black coat and smooth skin is
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Albino coat and rough skin is
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Albino coat and smooth skin is
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To prove your hypothesis, you conducted a chi-square test and calculated chi-square of
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. Using a critical p-value of 0.05, you have a theoretical chi-square value of
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. Therefore, you
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your null hypothesis.