Exam 10: Chromosomes and Human Genetics

The gene for a certain sex-linked trait is found only on the Y chromosome.If the male parent carries this gene,which of the following statements about the inheritance of that trait is true?

The following diagrams show the same cell,but the homologous pairs are arranged differently in each diagram.The different arrangements of the homologous pairs in version A compared with version B provide an example of the concept of ________.

Two gametes that are both diploid for the sex chromosomes join to form a zygote.Which of the following genotypes would result?

The allele responsible for causing Huntington disease is

How do genes on autosomes play a role in sex determination?

Ichthyosis is a recessive X-linked disorder that causes a person's skin to flake off like fish scales.A normal man and a normal woman produce a child with ichthyosis.This child cannot be female.

The following figure contains a pedigree for brachydactyly,an autosomal dominant disorder.Which of the following is true?

An allele that appears to "skip generations" is most likely

Genes A and B are located on the same chromosome.Two parent organisms with the genotypes AABB and aabb were crossed.One of the resulting AaBb offspring was experimentally crossed with an aabb individual.The final offspring genotypes were AaBb,aabb,Aabb,and aaBb. Which of the final offspring genotypes were produced through crossing-over?

Genes become linked when crossing-over occurs between nonhomologous chromosomes.

A female who is a carrier of the sex-linked gene A has the genotype ________.

Because an individual with an XX genotype is a female,is an individual with an XO (no second sex chromosome)a male?

Two chromosomes that have the same set of genes,but perhaps different versions of those genes,are called ________ chromosomes.

A chart that shows genetic relationships within a family over several generations is called a ________.

The ________ gene is responsible for activating many genes involved in "maleness" during embryonic development.

Many experiments have been performed on humans to study the inheritance of genetic traits through generations.

The following figure contains a pedigree for cystic fibrosis,an autosomal recessive disorder.Which of the following is true?