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What fraction of their babies will be:

What fraction of their babies will be:

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Quarter horses (for the information of non-gamblers, these are an actual breed of race horses; not all of the rest of this problem is very actual however) are produced in a two-stage process. First, a whole horse is cut in half to produce half horses. This requires a functional A gene. If there is no functional A gene, the horse remains whole. Second, the B gene cuts the half horses into quarter horses. However, a dominant C gene (C-) will block the action of the B gene, leading to a half horses instead of quarter horses. See diagram below. These 3 genes are UNLINKED. A BIBB| Bb|CCCCc b[Bbl bb C.ee A AA Ag B Whole horses → Half horses Quarter horses a Aal aa An AaBbCc horse was crossed to an AaBbes,horse (both parents have slightly different genotypes!). What fraction of their babies will be: (Hint: ask yourself what's required for each gene dominant or recessive then multiply) a) whole horses? b) quarter horses? с) half horses (hint: figure out parts a and b first, and then using those #s, figure out this one.) Now show how to directly find the half horse amount. d) Hints: Find all the nonoverlapping, mutually exclusive ways to be a half horse. What are they? Next, what do you do with these numbers? If you get the same answer you got in part c, then you probably got it right.
Transcribed Image Text:Quarter horses (for the information of non-gamblers, these are an actual breed of race horses; not all of the rest of this problem is very actual however) are produced in a two-stage process. First, a whole horse is cut in half to produce half horses. This requires a functional A gene. If there is no functional A gene, the horse remains whole. Second, the B gene cuts the half horses into quarter horses. However, a dominant C gene (C-) will block the action of the B gene, leading to a half horses instead of quarter horses. See diagram below. These 3 genes are UNLINKED. A BIBB| Bb|CCCCc b[Bbl bb C.ee A AA Ag B Whole horses → Half horses Quarter horses a Aal aa An AaBbCc horse was crossed to an AaBbes,horse (both parents have slightly different genotypes!). What fraction of their babies will be: (Hint: ask yourself what's required for each gene dominant or recessive then multiply) a) whole horses? b) quarter horses? с) half horses (hint: figure out parts a and b first, and then using those #s, figure out this one.) Now show how to directly find the half horse amount. d) Hints: Find all the nonoverlapping, mutually exclusive ways to be a half horse. What are they? Next, what do you do with these numbers? If you get the same answer you got in part c, then you probably got it right.
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