Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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QUESTION 8
A researcher is trying to determine the relationship between the A gene and 3 other genes (B, C and D). She performs
three test crosses to determine if the genes are unlinked, incompletely linked or completely linked. Next to each cross is
the ratio for the progeny of the cross. In the 3rd column please indicate whether the gene pair being tested is unlinked,
incompletely linked or completely linked.
Ratio (Alleles indicate phenotype of progeny)
Type of Linkage (incompletely linked,
completely linked or unlinked)
Crosses
AaBb x aabb
1 AB: 1 Ab: 1 aB: 1 ab
AaCc x aacc
6 AC: 6 ac: 1 Ac: 1 aC
AaDd x aacc
1 AD: 1 ad
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Transcribed Image Text:QUESTION 8 A researcher is trying to determine the relationship between the A gene and 3 other genes (B, C and D). She performs three test crosses to determine if the genes are unlinked, incompletely linked or completely linked. Next to each cross is the ratio for the progeny of the cross. In the 3rd column please indicate whether the gene pair being tested is unlinked, incompletely linked or completely linked. Ratio (Alleles indicate phenotype of progeny) Type of Linkage (incompletely linked, completely linked or unlinked) Crosses AaBb x aabb 1 AB: 1 Ab: 1 aB: 1 ab AaCc x aacc 6 AC: 6 ac: 1 Ac: 1 aC AaDd x aacc 1 AD: 1 ad
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