Researchers have discovered that some regions of chromosomesare much more likely than others to cross over. We might callsuch a region a “hot spot” for crossing over. Let’s suppose thattwo genes, gene A and gene B, are 5,000,000 bp apart on thesame chromosome. Genes A and B are in a hot spot for crossingover. Two other genes, let’s call them gene C and gene D, are also5,000,000 bp apart but are not in a hot spot for crossing over. Ifwe conducted two-factor crosses to compute the map distancebetween genes A and B and other two-factor crosses to compute themap distance between genes C and D, would the calculated mapdistance between A and B be the same as that between C and D? Explain.

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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Researchers have discovered that some regions of chromosomes
are much more likely than others to cross over. We might call
such a region a “hot spot” for crossing over. Let’s suppose that
two genes, gene A and gene B, are 5,000,000 bp apart on the
same chromosome. Genes A and B are in a hot spot for crossing
over. Two other genes, let’s call them gene C and gene D, are also
5,000,000 bp apart but are not in a hot spot for crossing over. If
we conducted two-factor crosses to compute the map distance
between genes A and B and other two-factor crosses to compute the
map distance between genes C and D, would the calculated map
distance between A and B be the same as that between C and D? Explain.

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