Question

Please help fast!!

Red-green color blindness is an X-linked recessive disorder.

What is the probability of having red-green color blindness for the cross that is represented by the Punnett square?
a) 0 percent
b) 25 percent
c) 50 percent
d) 75 percent

Answer 1

What is the probability of having red-green color blindness for the cross that is represented by the Punnett square?

0 percent

25 percent

50 percent

75 percent

Answer B or 25%

just took the test good luck on your test

Answer 2

The correct answer would be b) 25 percent.

In females, X-linked recessive disorder is expressed only when the mutated gene is present in both the X chromosomes whereas in males presence of only one copy of mutated gene is sufficient to cause the disease as they have only one X chromosome.

Now the given cross will results in the production of:

• Two daughters- one is homozygous dominant (
  `X^(B)X^(B)`) and other is heterozygous dominant
  `X^(B)X^(b)`
• Two sons- one carries dominant gene (
  `X^(B)Y`) and other carries recessive or mutated gene (
  `X^(b)Y`).

From the test, it is clear that only one son out of 4 offspring carries the disease.

Hence, the probability will come out to be 1/4 = 0.25 or 25 percent.