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Question 1: In a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea pigs. Let’s call the gene associated with guinea pig color (A). What are the parent genotypes? A. (AA) and (AA) B. (AA) and (aa) C. (Aa) and (aa) D. (Aa) and (Aa) E. There is more than one correct answer What are the F1 genotypes? A. All (AA) B. All (Aa) C. (1)/(2) (Aa) and (1)/(2) (aa) D. ¼ (AA), (1)/(2) (Aa), ¼ (aa) E. (1)/(2) (AA) and (1)/(2) (Aa) Question 2: Examine the pedigree below. The phenotype of interest is represented in blue when observed in an individual. Is the phenotype Dominant or recessive? A: Dominant B: Recessive 

          Question 1:
In a cross between a black and a white guinea pig, all members of the F1 generation are
black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea
pigs.
Let’s call the gene associated with guinea pig color (A). What are the parent genotypes?
A. (AA) and (AA)
B. (AA) and (aa)
C. (Aa) and (aa)
D. (Aa) and (Aa)
E. There is more than one correct answer
What are the F1 genotypes?
A. All (AA)
B. All (Aa)
C. (1)/(2) (Aa) and (1)/(2) (aa)
D. ¼ (AA), (1)/(2) (Aa), ¼ (aa)
E. (1)/(2) (AA) and (1)/(2) (Aa)
Question 2: Examine the pedigree below. The phenotype of interest is represented in
blue when observed in an individual.
Is the phenotype Dominant or recessive?
A: Dominant B: Recessive
Show more…

Added by Jamie C.

Biology for AP Courses
Biology for AP Courses
Julianne Zedalis, John Eggebrecht
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Question 1: In a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea pigs. Let’s call the gene associated with guinea pig color (A). What are the parent genotypes? A. (AA) and (AA) B. (AA) and (aa) C. (Aa) and (aa) D. (Aa) and (Aa) E. There is more than one correct answer What are the F1 genotypes? A. All (AA) B. All (Aa) C. (1)/(2) (Aa) and (1)/(2) (aa) D. ¼ (AA), (1)/(2) (Aa), ¼ (aa) E. (1)/(2) (AA) and (1)/(2) (Aa) Question 2: Examine the pedigree below. The phenotype of interest is represented in blue when observed in an individual. Is the phenotype Dominant or recessive? A: Dominant B: Recessive
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Transcript

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00:01 All right.
00:01 So we have this guinea pig question where we have our black dominant gene, and that's going to be dominant over the white recessive gene in this guinea pig.
00:13 So it tells us that we have a pure breeding black guinea pig, which means that this guinea pig is going to be big b, big b.
00:21 Pure breeding means that it's always going to have, if you cross it with another pure breeding, you're only going to get that phenotype.
00:29 And then we have a, a pure breeding or homozygous white guinea pig.
00:35 So we're going to cross these two guinea pigs.
00:41 And we just set up a punnet square.
00:44 So we're going to bring our big b down, little b across, big b down, little be across, big b down, little b across.
00:55 Big b down, little b across.
00:58 So for this generation, this is going to be the f1 generation, we are going to get four out of four probability of big b, little b, or black guinea pigs.
01:14 So otherwise, 100 % chance of black guinea pigs.
01:20 Oh, so the female in this case, so the female is going to give the big b gene, the male in this question is going to give the little b gene.
01:34 And then your genotype ratio was the 100 % 100 % big b little b...
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