Use this information to answer thequestion: You have guinea pigs from two pure b

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Use this information to answer thequestion:

You have guinea pigs from two pure breeding lines. One line has black fur and red eyes the other line has white fur and blue eyes. When you cross them, all the F1 guinea pigs have black fur and blue eyes. When you cross the F1s to one another you get a total of 50 F2 offspring. There are 31 with black fur and red eyes, 15 with white fur and blue eyes, 2 with white fur and red eyes, and 2 with black fur and blue eyes. There are approximately equal numbers of males and females in each phenotypic category.

Question 3 Based on what you know, what kind of cross is being done here? autosomal monohybrid cross autosomal dihybrid cross sex-linked monohybrid cross sex-linked dihybrid cross 2 points Save Answer

Explanation / Answer

Question 3

Answer :

It is autosomal dihybrid cross----------------answer

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Let Fur color be represented as:

Black------allele------- (B)

White ------allele-------(b)

Let Eye color be denoted with:

Blue ------allele-------(R)

Red------allele------- (r)

==============================

One line has black fur and red eyes-----------BBrr

the other line has

white fur and blue eyes--------------bbRR

black fur and red eyes-----------BBrr X white fur and blue eyes--------------bbRR

Gametes -------------- Br --------bR

When you cross them, all the F1 guinea pigs have black fur and blue eyes

Br

bR

Br bR

black fur and blue eyes

F1-------OFFSPRING- Bb Rr--------black fur and blue eyes

Br

bR

Br bR

black fur and blue eyes

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