Red-green colorblindness is caused by a recessive allele on the X chromosome. A

Question

Red-green colorblindness is caused by a recessive allele on the X chromosome. A man who is colorblind has _____ chance of passing the colorblindness allele to his daughters and _____ chance of passing the allele to his sons.

Select one:

a. 100% daughters; 0% sons

b. 50% daughters; 50% sons

c. 0% daughters; 50% sons

d. 0% daughters; 100% sons

In mitosis, during what phase does the nuclear envelope re-form around the DNA to form a new nucleus?

Select one:

a. Anaphase

b. Prophase

c. Cytokinesis

d. Telophase

Explanation / Answer

A. 100% daughters 0% son.

Red - green colo blindness is an X linked recessive disorder. Since males are hemizygous for x linked triats, this disorder is expressed in males if their X chromosomes carries a mutant allele. Females however need both of their X chromosomes carry mutant allele for red gredn color blindness to express this triat.

Males pass their X chromosome to their daughters and not to their son, so red green color blind male has 100% chance to pass this allele to daughter and 0% chance to pass the allele to son.

2. D. Telophase.

During telophase, chromosomes decondense , become thin thread like structures, spindle disappears and nuclear membrane is reformed around daughter chromosomes.

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