Chapter 8 test

11

If there are 22 chromosomes in the nucleus of a road skin cell, a toad egg would contain blank chromosomes.

Large cells containing many nuclei

In certain fungi and algae, cells under go mitosis repeatedly without subsequently undergoing cytokinesis. What would result from this?

Prophase

In the telophase of mitosis, the mitotic spindle breaks down and nuclear envelopes form. This is essentially the opposite of what happens in

Part of a chromosomal inverted

It would be most difficult to spot which of the following by looking at a karyotype?

Bacteria have to duplicate their DNA before dividing; humans do not.

There are a number of differences between binary fission of a bacterium and human cell division. Which of the following is not one of them?

50 units

A cell biologist carefully measured the quantity of DNA in grasshopper cells growing cell culture. Cells examine during the G2 phase of the cell cycle contained 200 units of DNA. What would be the amount of DNA in one of the grass hopper daughter cel

Mitosis

A culture of mouse cells is treated with a chemical that interferes with he activity of microfilaments. Which of the following will probably be the most affected?

92

A human bone marrow cell, in prophase of mitosis contains 46 chromosomes. How many chromatids does it contain altogether?

Prophase II of meiosis

A picture of dividing pigeon cell taken through a microscope shows that the cell contains seven chromosomes, each consisting of two chromatids . His picture must have been taking during ..

100 chromosomes each consisting of one chromatid

A zoologist Examine and intestine cell from a crayfish and counted 200 chromosomes each consisting of two chromatids at prophase I of mitosis. What would he expect to see in each of the four cells at telophase II of meiosis if he looked in the crayfish crayfish ovary?

Important in genetic recombination

Crossing over is

Presence of a Y chromosome

Disorders involving unusual members of sex chromosomes show that "maleness" is caused by the

Meiosis takes much longer in the ovary increasing he likelihood of error

Geneticists suspect that was xtra chromosome seen in Down syndrome usually come from the egg rather than the Sperm because ...

Somatic cells...gametes

Human blank are diploid and human blank are haploid

Translocation followed by deletion

Humans have 23 pairs while our closest relatives chimpanzees have 24. Chromosomes studies indicate that at some point early in human evolution two chromosomes simultaneously broke into a large portion and a small portion. The large parts combine to form a much smaller chromosome which was subsequently lost. This important chromosomal change could best be described as

Halves the number of chromosomes in the cells.

Meiosis..

G1

Most cells will divide if they receive the proper signal at a checkpoint in the blank phase of the cell cycle

Genes j and K

One chromosome of a homologous pair carries the genes j and k. The other chromosome of the pair carries J and K at the corresponding loci. Crossing over results in exchange of chromosome segments and production of gametes with new combination of genes. A "recombinant" type gamete resulting from this crossover might contain

Cross over during prophase 1 of meiosis

Sister chromatids....

Carry information for the same characteristics at corresponding locations.

Two chromosomes of a homologous pair ..

100 units

What would be the quantity of DNA in one of the grasshopper cells produced by telophase II of meiosis

Sister chromatids

Which of the following carry the same genetic information?

Deletion

Which of the following chromosomal alterations would you expect to have the most drastic cons quenches?

G1 immediately follows cell division

Which of the following correctly matches a phase of the cell cycle with its description?

Division of chromosomes during anaphase of mitosis

Which of the following does not lead to genetic variability?

Production of gametes

Which of the following is not a function of mitotic cell division in animals?

They are haploid

Which of the following is not true of human somatic

Homologous pairs of chromosomes are split up in meiosis.

Which of the following is the most significant difference between meiosis and mitosis?

Muscle cell

You would be unlikely to see which of the following human cells dividing?