a. Before Mendel formulated his law of segregation, what two alternative hypotheses might he have formulated about the kinds of gametes for a parent that is Yy (Y = yellow peas; y = green peas)?

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b. How did his results of 3 yellow to 1 green support one of these hypotheses and not the other?

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c. Before Mendel formulated his law of independent assortment, what two alternative hypotheses might he have formulated about the kinds of gametes for a parent in Figure 23.6?

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d. How did his results of 9:3:3:1 support one of these hypotheses and not the other?

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a. What fault have albinos inherited?

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b. Considering your answer to question 2a, why would you have predicted that albinism is a recessive rather than a dominant disorder?

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c. What possible crosses would produce an offspring that is an albino? Are any of these individuals carriers?

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d. Suppose you want to ensure that children born to an albino woman have normal pigmentation. Which of these-melanin, enzyme to produce melanin, or a normal gene-would you inject into the egg?

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a. From these results, which characteristic is dominant?

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b. They went on to perform this cross:

F₁ x F₁    red-eyed female x red-eyed male
F₂        red-eyed female 1:1 red- to white-eyed male

Are these results explainable if the allele for red/white eye color is on the Y chromosome but not on the X chromosome? On the X chromosome but not on the Y chromosome? Explain. How do these results support the hypothesis that genes are on the chromosomes?

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