Exam 8: The Cellular Basis of Reproduction and Inheritance

A cell is initially diploid, but it has a unique cell cycle in that this cell goes through two S phases instead of one. What would the remainder of its cell cycle consist of if this cell is to produce four identical diploid daughter cells at the end of its cell cycle?

Which of the following statements is false?

Eukaryotic cells spend most of their cell cycle in which phase?

After reading the paragraphs below, answer the questions that follow. A technique called flow cytometry is used by scientists and researchers to count or sort cells based on specific properties. By labeling cellular DNA with a fluorescent dye, flow cytometry can sort cells based on the amount of DNA present, thereby making it possible to distinguish between cells that are in different stages of the cell cycle. Flow cytometry is especially useful to the medical community because it can help with the diagnosis of certain types of cancers. Below is a typical set of data that you might obtain when running a flow cytometry experiment using a sample of healthy skin cells. Use this figure to help you answer the following questions. -Which peak represents cells that contain the most DNA?

A pair of sex chromosomes found in a human male is most like

Nondisjunction occurs when

Which of the following is probably the main factor responsible for the phenomenon of density-dependent inhibition?

Which of the following helps maintain the structure of chromosomes and control the activity of genes?

Which of the following types of organisms commonly demonstrates polyploidy?

Which of the following shows the greatest promise as a cancer chemotherapy agent?

At a chiasma, two ________ are attached to each other.

What event will immediately follow the event shown in this image?

Which of the following statements regarding prokaryotes is false?

Which of the following statements regarding Down syndrome is false?

After reading the paragraphs below, answer the questions that follow. A technique called flow cytometry is used by scientists and researchers to count or sort cells based on specific properties. By labeling cellular DNA with a fluorescent dye, flow cytometry can sort cells based on the amount of DNA present, thereby making it possible to distinguish between cells that are in different stages of the cell cycle. Flow cytometry is especially useful to the medical community because it can help with the diagnosis of certain types of cancers. Below is a typical set of data that you might obtain when running a flow cytometry experiment using a sample of healthy skin cells. Use this figure to help you answer the following questions. -Which peak corresponds to cells in G₁? In S phase? In G₂?

Which of the following statements correctly describes the behavior of a tetrad during anaphase I of meiosis?

After reading the paragraphs below, answer the questions that follow. Mr. and Mrs. Smith have three sons in elementary school. Two of their children are progressing normally, but their youngest son, Charles, has been much slower than his siblings in developing speech and language skills. His parents are concerned that he has a learning disability and decide to investigate further. Since some learning disabilities can be genetically based, their pediatrician recommends a chromosomal analysis. The results show that Charles has a trisomy of the sex chromosomes, diagnosed as XYY, which is caused by nondisjunction in the formation of the father's sperm. The nondisjunction resulted in an extra copy of the Y chromosome. The extra copy was passed on to Charles during fertilization. Most often, this chromosomal change causes no unusual physical features or medical problems, but those with trisomy of the sex chromosomes do have a higher than normal risk of delays in learning development. -If Charles gets married and starts a family, which of the following chromosomal abnormalities has an increased chance of occurring in his children?

How many generations does it take to develop a new plant species by polyploidy?

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

Mature human nerve cells and muscle cells