Exam 19: Chromosomes and Cell Division

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

Complete the following table concerning mitosis and meiosis:

Crossing over in Prophase I and ________ in Metaphase I increase the genetic variation from one generation to another.

In which phase does the chromatin condense into chromosomes,the nuclear membrane disintegrates,and the centrioles migrate to the poles as spindle fibers are organized?

What is decreased during the process of meiosis?

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?

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

In which phase of meiosis I do homologues separate?

Match each definition in the first column to the correct term in the second column. -A phase in the mitotic division in which a nuclear membrane forms around each group of chromosomes at the two poles.

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

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

Match each definition in the first column to the correct term in the second column. -This cell possesses only a single set of chromosomes.

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

Compare and contrast the processes of oogenesis and spermatogenesis.

Two replicated chromosomes are joined together at a region on the chromosome called the ________.

Polar bodies are unique products of ________.

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 he will have the gene?

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 as opposed to her 50-year-old husband's sperm cells.Explain why.

DNA that has wrapped around histones and is in a condensed form following interphase is called ________.

Match each definition in the first column to the correct term in the second column. -A phase in mitosis in which the chromosomes line up at the center of the cell .J)Independent assortment