In a cross between a black and a white guinea pig, all members of the F1...
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.
A. Based on this cross, which trait is dominant and which is recessive? What information lead you to your conclusion?
B. Diagram this cross, showing the genotypes and phenotypes of parental, F1 and F2 generations.
C. What will the offspring be like if two F2 generation white guinea pigs are mated?
Homework Answers
When black and white pigs are crossed then all the members turn out to be black in the F1 generation.
When F1 offsprings are crossed then 3 are black and 1 is white.
This is the same case as law of dominance and law of segregation.
Black is a dominant trait. This is concluded because the dominant character is there in F1 generation according to law of dominance. Dominant character is able to express itself.
In F2 generation characters are segregated.
B.
| B | B | |
| b | Bb | Bb |
| b | Bb | Bb |
In F2 generation
| B | b | |
| B | BB | Bb |
| b | Bb | bb |
C
All of the offsprings will be white as white is recessive.
Add Answer to:
In a cross between a black and a white guinea pig, all
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Genetics
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Directions: For the following questions, create a Punnett square. Be sure to show the genotypes, phenotypes,...
Directions: For the following questions, create
a Punnett square. Be sure to show the genotypes,
phenotypes, and percentages for each cross.
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Black (B) color in guinea pigs is dominant to white (b). A female from a pure breeding black strain is crossed with a male from a pure breeding white strain what is the parental cross using a Punnett square
1. The cross between a white cat and a black cat gve in F1 generation black...
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with brown fur and all offspring had black fur. ne of the resulting F2 progeny were brown 7. A guinea pig with black fur was bred to one with brown fur and all offspring na When two of these F1 offspring were bred, some of the resulting F2 progeny while others were black. a. What is the dominant phenotype? How do you know?__ b. Create symbols to represent the alleles for coat color in guinea pigs. Black = Brown =...
2. An animal scientist crossed a strain of large guinea pigs and a strain of small guinea pigs, and finds the Fı are phenotypically uniform, with an average size intermediate between the two parents. She allows the Fı individuals to inter-mate, resulting in 1014 F2 individuals (guinea pigs are prolific). In the resulting F2 generation, 4 guinea pigs were in the smallest size class (which is the same as the small parental line). a. From these data, estimate the number...
In guinea pig, white coat (f) is recessive to black coat (F) and curly hair (h) is recessive to straight hair (H). A breeder crosses a guinea pig that is homozygous for white coat and curly hair with a guinea pig that is black with straight hair. The F1 are then crossed with guinea pig having white coat and curly hair in a series of testcrosses. The following progeny are produce from these testcrosses: white, curly 31 white, straight 12...
Has there been an interchange of babies? Support your | بهانم unea pigs rough hair (R) lis dominant with respect to smooth hair (d), and black hair (B) is dominant with pect to white (b). These genes are not linked (.e., the locus for hair color is not on the same chromosome as the focus for hair texture), nor are they sex-linked. Cross a guinea pig heterozygous for haic texture and color, with & white-smooth-haired guinea pig. Describe the predicted...
Directions: For the following questions, create
a Punnett square. Be sure to show the genotypes,
phenotypes, and percentages for each cross.
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