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Ch. 14 - Mendel and the Gene Idea
All textbooksCampbell 12th EditionCh. 14 - Mendel and the Gene IdeaProblem 14
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Chapter 14, Problem 14

Imagine that you are a genetic counselor, and a couple planning to start a family comes to you for information. Charles was married once before, and he and his first wife had a child with cystic fibrosis. The brother of his current wife, Elaine, died of cystic fibrosis. What is the probability that Charles and Elaine will have a baby with cystic fibrosis? (Neither Charles, Elaine, nor their parents have cystic fibrosis.)

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Hello everyone here we have a question that says Jack was married to Diana. Both are carriers of an a little assisted fibrosis. What is the probability that Jack and Diana will have a baby with cystic fibrosis? So they are both characters which carriers? Which means they are hetero Guidice hetero zegas. So we're going to say capital C. Little C. So that is Jack and that is diane. And we're going to make our punnett square. So first we have capital C. Capital C. So that's home as I guess normal. Then we have capital C. Little C. That's hetero sickos normal. Then we have capital C. Lower K. C. That's hetero Z. Is normal. And then we have to lower case sees that is homogeneous. And the baby will have cystic fibrosis. So our answer here is a 1/4 of the baby's well there's a 1/4 chance that Jack and Diana will have a baby with cystic fibrosis. Thank you for watching. Bye.
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Textbook Question

In tigers, a recessive allele of a particular gene causes both an absence of fur pigmentation (a white tiger) and a cross-eyed condition. If two phenotypically normal tigers that are heterozygous at this locus are mated, what percentage of their offspring will be cross-eyed? What percentage of cross-eyed tigers will be white?

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Textbook Question

In maize (corn) plants, a dominant allele I inhibits kernel color, while the recessive allele i permits color when homozygous. At a different locus, the dominant allele P causes purple kernel color, while the homozygous recessive genotype pp causes red kernels. If plants heterozygous at both loci are crossed, what will be the phenotypic ratio of the offspring?

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Textbook Question

The pedigree below traces the inheritance of alkaptonuria, a biochemical disorder. Affected individuals, indicated here by the colored circles and squares, are unable to metabolize a substance called alkapton, which colors the urine and stains body tissues. Does alkaptonuria appear to be caused by a dominant allele or by a recessive allele? Fill in the genotypes of the individuals whose genotypes can be deduced. What genotypes are possible for each of the other individuals?

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