Answer to Question #166769 in Genetics for mobina

Question #166769

n humans, colour blindness is due to an “X” linked recessive trait we shall represent with the symbols Xn. Females that carry a hidden recessive gene for colour blindness in the heterozygous condition are called “CARRIERS”

Show two different crosses that would result in possible colorblind daughters.



1
Expert's answer
2021-02-26T04:30:09-0500

The first possible cross is between a color blind man and a color blind carrier woman.Therefore, the color blind chromosome will be shown as XN in a man ,since they carries one X. The X will carry the color blind gene. A woman has two XX chromosomes she can be carrier or color blind. The Recessive trait in a woman will be XXn. The following illustration shows the crossing between a color blind man and color blind carrier woman.

XNY XnX

Results

XNXn- Color blind daughter

XNX- daughter color blind gene carrier

The second possible cross is between a color blind husband and a color blind woman .In this case all the daughters will be color blind.


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