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In rats, the following genotypes of two independently assorting autosomal genes determine coat color as follows: A-B- (gray), A-bb (yellow), aaB- (black), aabb (cream). A third gene pair on a separate autosome determines whether or not any color will be produced. DD and Dd genotypes allow color according to the expression of the A and B alleles. However, the dd genotype results in albino rats regardless of alleles of the A and B alleles present. Determine the phenotypic ratios of the offspring from the following crosses:

AaBbDd x AaBbDd

Respuesta :

Answer:

19/36 Gray, 9/36=1/4 albino, 5/36 yellow and 3/36-1/12 Black offspring.

Explanation:

To produce a gray- A-B-

To produce yellow - A-bb

To produce black - aaB-

To produce cream - aabb

To produce any colour among the above - D-

To produce an albino - dd

A cross between two grays will give rise to  

                      AaBbDd   x     AaBbDd

 19/36 Gray, 9/36=1/4 albino, 5/36 yellow and 3/36-1/12 Black offspring

The phenotypic ratios of the offspring from the following crosses are :

-19/36 Gray, 9/36=1/4 albino, 5/36 yellow and 3/36-1/12 Black offspring

"Phenotypic Ratios"

  • To produce a gray- A-B-
  • To produce yellow - A-bb
  • To produce black - aaB-
  • To produce cream - aabb
  • To produce any colour among the above - D-
  • To produce an albino - dd

A cross between two grays will give rise to  

                                   AaBbDd   x     AaBbDd

19/36 Gray, 9/36=1/4 albino, 5/36 yellow and 3/36-1/12 Black offspring

Learn more about autosomal gene:

https://brainly.com/question/23948550?referrer=searchResults

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