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2 3. (6 points) In mice, fur color is controlled by two genes that exhibit complete dominance. Gene B encodes an enzyme that produces either brown or black pigment in the fur: brown fur color (B) is dominant to black fur color (b). A second gene has a recessive allele (a) that leads to an albino (all white) phenotype. Expression of the dominant allele (A) has no effect on the fur color phenotype. The Punnett square shows the results of crossing a brown mouse (BbAa) with a black mouse (bbAa). a. What genetic phenomenon is this an example of? EPISTASIS b. What is the expected phenotypic ratio of offspring from this cross? 1:2:2:1:CI 3 BLACK: 3 BROWN: Z ALBINO 1 = Bbuu bb AA 2b au 1 = BLAA 2= BAA4 brown parent 14 BA 14 Ba ½ bA ½ ba black parent ½ bA BbAA bbAA ½ ba BbAa Bbaa bbAa BbAa bbAa bbaa 122

2 3. (6 points) In mice, fur color is controlled by two genes that exhibit complete dominance. Gene B encodes an enzyme that produces either brown or black pigment in the fur: brown fur color (B) is dominant to black fur color (b). A second gene has a recessive allele (a) that leads to an albino (all white) phenotype. Expression of the dominant allele (A) has no effect on the fur color phenotype. The Punnett square shows the results of crossing a brown mouse (BbAa) with a black mouse (bbAa). a. What genetic phenomenon is this an example of? EPISTASIS b. What is the expected phenotypic ratio of offspring from this cross? 1:2:2:1:CI 3 BLACK: 3 BROWN: Z ALBINO 1 = Bbuu bb AA 2b au 1 = BLAA 2= BAA4 brown parent 14 BA 14 Ba ½ bA ½ ba black parent ½ bA BbAA bbAA ½ ba BbAa Bbaa bbAa BbAa bbAa bbaa 122

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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3. (6 points) In mice, fur color is controlled by two genes that exhibit complete dominance. Gene B encodes an enzyme that produces either brown or black pigment in the fur: brown fur color (B) is dominant to black fur color (b). A second gene has a recessive allele (a) that leads to an albino (all white) phenotype. Expression of the dominant allele (A) has no effect on the fur color phenotype. The Punnett square shows the results of crossing a brown mouse (BbAa) with a black mouse (bbAa). 2 a. What genetic phenomenon is this an example of? EPISTASIS b. What is the expected phenotypic ratio of offspring from this cross? 1:2:21:11 3 BLACK: 3 BROWN: Z ALBINO 1 = Bbuu bb AA 1 = bau B6AA 1 = 2= BAAu 2=bb A₂₁ brown parent 14 BA 14 Ba black parent ½ ba ½ bA BbAA BbAa ½ ba BbAa Bbaa 1/4 bA bbAA bbAa bbAa bbaa 1:2:2
Transcribed Image Text:3. (6 points) In mice, fur color is controlled by two genes that exhibit complete dominance. Gene B encodes an enzyme that produces either brown or black pigment in the fur: brown fur color (B) is dominant to black fur color (b). A second gene has a recessive allele (a) that leads to an albino (all white) phenotype. Expression of the dominant allele (A) has no effect on the fur color phenotype. The Punnett square shows the results of crossing a brown mouse (BbAa) with a black mouse (bbAa). 2 a. What genetic phenomenon is this an example of? EPISTASIS b. What is the expected phenotypic ratio of offspring from this cross? 1:2:21:11 3 BLACK: 3 BROWN: Z ALBINO 1 = Bbuu bb AA 1 = bau B6AA 1 = 2= BAAu 2=bb A₂₁ brown parent 14 BA 14 Ba black parent ½ ba ½ bA BbAA BbAa ½ ba BbAa Bbaa 1/4 bA bbAA bbAa bbAa bbaa 1:2:2
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