Question

Part 4: Sex-Linked Inheritance—Predicting Color Blindness in Offspring

Answer 1

1.cc
2.Cc
3.Yes a female can have color blindness, but it is far less likely than a male , as both her x chromosomes would have to have the recessive c .
4.
5.All would be carriers, as they would each get Cc , because those are the only inheritable genotypes.
6.The male children would all be non colorblind , because they inherit a y from their dad to be male , and the mom isn't a carrier , so the only x they inherit is a C.

Answer 2

Answer and explanation.

1. The genotype of a male with red-green color blindness is XcY.

2. The genotype of a female who is not color-blind but is a carrier is XcXC. She carries the color-blind allele but is not dominat, so she is not affected by it.

3. Yes, a female can have red-green color blindness, if her two X chromosomes are cX (recessive), she will have red-green color blindness. In other words, if the two X chromosomes carry the allele for color-blindness she will be affected by it.

4. Possible genotypes are Cc, CC, Cc, and CC. or as it is in the Punnet square XcXc, XcY, XCXc, XCY.

      ║    Xc  ║ Y

Xc ║ XcXc ║ XcY

XC ║ XCXc║ XCY

5. The female children will be carriers of the color-blind allele becaus one of her two X chromosomes, has the recessive allele for color-blind while the other X chromosome has not the allele for color-blindness.

6. None of the male children will be color-blindness because the allele for color-blindness is carried by the X chromosome of the father and they inherit the X chromosome from the mother, who is color-blind free.