Dr. Griffin is treating a young couple who are having a child. The parents are worried that since the mom is a carrier for the disorder of color blindness that the child will have color blindness as well. The father does not have color blindness. What are the chances that the child will NOT have color blindness? Use XB for no color blindness and Xb for having color blindness.
A)100%
B)50%
C)0%
D)75%
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B is the Correct ans.......50%
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The 23rd chromosome is made up of two parts – either two X chromosomes if you are female or an X and a Y chromosome if you are male. The ‘gene’ which causes (inherited, red and green types of) colour blindness is found only on the X chromosome. So, for a male to be colour blind the colour blindness ‘gene’ only has to appear on his X chromosome. For a female to be colour blind it must be present on both of her X chromosomes.
If a woman has only one colour blind ‘gene’ she is known as a ‘carrier’ but she won’t be colour blind. When she has a child she will give one of her X chromosomes to the child. If she gives the X chromosome with the colour blindness ‘gene’ to her son he will be colour blind, but if he receives the X chromosome which doesn’t carry the colour blindness ‘gene’, he won’t be colour blind.
A colour blind boy can’t receive a colour blind ‘gene’ from his father, even if his father is colour blind, because his father can only pass an X chromosome to his daughters.
A colour blind daughter therefore must have a father who is colour blind and a mother who is a carrier (who has also passed the colour blindness ‘gene’ to her daughter).
Explanation:
therefore there is 0% chances..
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