For all of the testcross problems, indicate parental phenotypes, genotypes and gametes; indicate genotypes and phenotypes off offspring. Show your work on a separate sheet(s) of paper! I. Complete Dominance House mice have two coat colors; gray (agouti, or wild type) and black. When true-breeding gray mice are crossed with true-breeding black mice, the F1 generation are all gray. In the F2 generation there are three gray to one black (3/4 gray : 1/4 black). Diagram the F1 cross, using G = gray, g = black. What genotypic and phenotypic ratios would you expect if you crossed a pure breeding gray mouse with a heterozygous mouse? Two gray mice with unknown ancestry are crossed. Can you determine from the phenotypes of their offspring if the parents are homozygous or heterozygous? Explain how.

Sir Gregor Mendel was a priest and a teacher who did the famous hybridization experiment on garden…

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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I. Complete Dominance

House mice have two coat colors; gray (agouti, or wild type) and black. When true-breeding gray mice are crossed with true-breeding black mice, the F₁ generation are all gray. In the F₂ generation there are three gray to one black (3/4 gray : 1/4 black).

Diagram the F₁ cross, using G = gray, g = black.

What genotypic and phenotypic ratios would you expect if you crossed a pure breeding gray mouse with a heterozygous mouse?

Two gray mice with unknown ancestry are crossed. Can you determine from the phenotypes of their offspring if the parents are homozygous or heterozygous? Explain how.

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