bio quiz

The person above has children with a partner that does not have hemophilia. Is it possible for any of their children to have hemophilia? Select the best answer and explanation.

• Yes - the hemophilia allele can skip a generation

• Yes - their son could receive the hemophilia allele

• Yes - their daughters could receive the hemophilia allele

• No - the normal allele will always mask the hemophilia allele

• No - neither of them have a hemophilia allele

Answer explanation

This was a tricky one so let's explain the answer.

The male parent does not have hemophilia, meaning his X chromosome has the normal allele (H) - this will always be passed onto any daughters, so daughters cannot have hemophilia.

The female parent is a carrier for hemophilia, as she has one hemophilia allele (h) - this COULD be passed onto a son, meaning the son would have hemophilia as they only have one X chromosome.

 

Which of the following genotypes belongs in the red box in the Punnett square?

• XBXb

• XbXb

• XbY

• XBY

Red-green color blindness is an X-linked recessive trait in humans. A colorblind woman and a man with normal vision have a son. What is the probability that the son is color blind?

• 25%

• 50%

• 75%

• 100%

A person has the genotype above. What is their phenotype?

• Female with Hemophilia

• Male with Hemophilia

• Female carrier of Hemophilia

• Male carrier of hemophilia

What would be genotype of a male hemophilia?

• XHY

• XhY

• XHXh

• XhXh

Which chromosome are most sex-linked traits found on?

• The X chromosome

• The Y chromosome

• The Z chromozome

• The 23rd chromosome

Males inherit colorblindness from

• their mother only

• their father only

• both their mother and father

Which blood type does NOT have an enzyme for putting A or B carbohydrate molecules on the red blood cells?

• A

• B

• AB

• O

A man with AB blood marries a woman with type A blood who says she is carrying his child. The child has O blood. Can this be his child?

• Yes

• No

Which blood type shows codominance?

• A

• B

• AB

• O