Exam 27: Chromosomes and Cell Division

You are looking at diagrams of cells in the process of division and are uncertain as to what process you are viewing (mitosis or meiosis). You determine that the cells you are looking at have 7 chromosomes. You can confidently assume that these cells are in which phase, based on this odd chromosome number?

During gamete formation at the end of telophase I, the ploidy of the daughter cells is ________, and each chromosome consists of ________ chromatid(s).

XO sex chromosomes are responsible for the following syndrome.

DNA replication occurs in the ________ of the cell cycle.

A gene on the Y chromosome causes a rare disease. A woman married to a man with the disease has three children. The first two are daughters without the disease. The third is a son. What is the probability that the son will have the gene?

A cell with a diploid number of 24 fails to undergo cytokinesis while performing mitosis, so the daughter cells do not form. How many chromosomes will be in the resulting cell?

In which stage of mitosis does exchange of genetic material between chromosomes (crossing over) occur?

The exchange of genetic material during crossing over causes which of the following?

In which phase do the following events occur: the chromatin condenses into chromosomes, the nuclear membrane disintegrates, and the centrioles migrate to the poles as spindle fibers are organized?

A 42-year-old woman becomes pregnant. Her physician recommends amniocentesis (a test for fetal chromosomal disorders). When the results are analyzed by the laboratory, it is determined that the fetus has 47 chromosomes. Name and fully explain what caused this disorder. When the woman and her husband consult a genetic counselor, they are told that this problem is likely to have occurred in the woman's egg cells, not in her 50-year-old husband's sperm cells. Explain why.

The separation of daughter cells is called ________.

The ________ are the 23rd pair of chromosomes that carry the traits that determine gender.

If a sperm cell contains 6 chromosomes, it must have come from an original parent cell that contained ________ chromosomes.

Compare and contrast the processes of oogenesis and spermatogenesis.

The most appropriate form of cell division for repairing an injured tissue is ________.

The condition in which there is only one representative of a particular chromosome in a cell is called ________.

Which of the following phases of mitosis is not matched with the appropriate activities that occur during that phase?

The failure of either homologous chromosomes to separate during meiosis I or sister chromatids to separate during meiosis II is called ________.

At the end of prophase II in meiosis, a human cell has ________ pairs of homologous chromosomes.

Polar bodies are unique products of ________.