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An example of X-linked inheritance First cross Second cross X Y Red female White male White female Red male Male gametes Male gametes Female gametes Female gametes Red temale Red male Red female White male Male gametes Male gametes 0 w Red female Red male Red female Red male Female gametes Female gametes | Red temale i Whte male i White female i White male FIGURE 2-17 Reciprocal crosses between red-eyed (red) and white-eyed (white) Drosophila give different results. The alleles are X linked, and the inheritance of the X chromosome explains the phenotypic ratios observed, which are different from those of autosomal genes. (In Drosophila and many other experimental systems, a superscript plus sign is used to designate the normal, or wild-type, allele. Here, wt encodes red eyes and w encodes white eyes.)

An example of X-linked inheritance First cross Second cross X Y Red female White male White female Red male Male gametes Male gametes Female gametes Female gametes Red temale Red male Red female White male Male gametes Male gametes 0 w Red female Red male Red female Red male Female gametes Female gametes | Red temale i Whte male i White female i White male FIGURE 2-17 Reciprocal crosses between red-eyed (red) and white-eyed (white) Drosophila give different results. The alleles are X linked, and the inheritance of the X chromosome explains the phenotypic ratios observed, which are different from those of autosomal genes. (In Drosophila and many other experimental systems, a superscript plus sign is used to designate the normal, or wild-type, allele. Here, wt encodes red eyes and w encodes white eyes.)

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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. In Figure 2-17, how does the 3:1 ratio in the bottom-lefthand grid differ from the 3:1 ratios obtained by Mendel?

An example of X-linked inheritance First cross Second cross X Y Red female White male White female Red male Male gametes Male gametes Female gametes Female gametes Red temale Red male Red female White male Male gametes Male gametes 0 w Red female Red male Red female Red male Female gametes Female gametes | Red temale i Whte male i White female i White male FIGURE 2-17 Reciprocal crosses between red-eyed (red) and white-eyed (white) Drosophila give different results. The alleles are X linked, and the inheritance of the X chromosome explains the phenotypic ratios observed, which are different from those of autosomal genes. (In Drosophila and many other experimental systems, a superscript plus sign is used to designate the normal, or wild-type, allele. Here, wt encodes red eyes and w encodes white eyes.)
Transcribed Image Text:An example of X-linked inheritance First cross Second cross X Y Red female White male White female Red male Male gametes Male gametes Female gametes Female gametes Red temale Red male Red female White male Male gametes Male gametes 0 w Red female Red male Red female Red male Female gametes Female gametes | Red temale i Whte male i White female i White male FIGURE 2-17 Reciprocal crosses between red-eyed (red) and white-eyed (white) Drosophila give different results. The alleles are X linked, and the inheritance of the X chromosome explains the phenotypic ratios observed, which are different from those of autosomal genes. (In Drosophila and many other experimental systems, a superscript plus sign is used to designate the normal, or wild-type, allele. Here, wt encodes red eyes and w encodes white eyes.)
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