Unit 6 Test Retake: The Human Genome - 6th Period

Front

What is androgenetic alopecia?

Back

Androgenetic alopecia is a common form of hair loss in both men and women, caused by an X-linked recessive trait.

Front

What is the genotype for a male without androgenetic alopecia?

Back

The genotype is X^B Y, where X^B is the normal hair allele.

Front

What is the probability that a son will inherit androgenetic alopecia if his mother has the condition and his father does not?

Back

100%.

Front

What does it mean if a trait is recessive in a pedigree?

Back

It means the trait can skip generations and individuals can be carriers.

Front

What is the most likely genotype for a carrier of a recessive trait?

Back

Gg.

Front

From whom do males inherit their X chromosome?

Back

Males inherit their X chromosome from their mother.

Front

What must the genotype of individuals with a recessive disorder be if they have affected offspring?

Back

Hh.

Front

What happens during mitosis if spindle fibers are not formed?

Back

Mitotic division stops in metaphase and cannot proceed to anaphase.

Front

What is the role of spindle fibers in cell division?

Back

Spindle fibers help separate chromosomes during mitosis.

Front

Define X-linked recessive trait.

Back

An X-linked recessive trait is a genetic condition that is expressed in males who have one copy of the allele and in females who have two copies.