bio 105 class 16 quiz

How many pairs of autosomes do humans have?

22

When observing a bird skin cell in G2 under a microscope, you count 160 total chromatids. How many chromosomes does a male chicken have in its sperm cells?

40

In anaphase I, __________.

homologous chromosomes move toward opposite poles

A fragment of chromosome 21 reattaches to chromosome 21, but in the reverse direction. What is the name given to this change?

inversion

Variation occurs when chromosomes are shuffled in _____.

meiosis

Homologous chromosomes possess the same genes arranged in the same order but may possess different __________ of some of these genes.

versions

Which of the following statements regarding mitosis and meiosis is false?

Meiosis provides for asexual reproduction.

You suspect that a serious developmental disorder is due to a chromosome abnormality and prepare a karyotype from an affected individual. In analyzing the karyotype, how could you distinguish trisomy from a chromosome structural defect such as a duplication?

In trisomy there would be one extra chromosome; in a duplication, the number of chromosomes would be normal, but one chromosome would have two copies of a portion of the chromosome.

Down syndrome can be the result of _____.

nondisjunction of chromosome 21 during meiosis

A karyotype is most like

photographs of every couple at a high school prom.