Mitosis and Meiosis
Which chromosomal alterations would you expect to have the most drastic consequences?
Deletion
If a mother cell starts with 20 chromosomes (it's diploid number) after MEIOSIS it will have 20 chromosomes
FALSE
Sex cells are produced by Mitosis
FALSE
At what checkpoint do most cells divide?
G1
Immediately follows cell division
G1
In certain fungi and algae, cells undergo mitosis repeatedly without subsequently undergoing cytokinesis. What would result from this?
Large cells containing many nuclei
Does division of chromosomes during anaphase of mitosis lead to genetic variability?
No
Mitosis produces two genetically identical daughter cells
TRUE
The stages of Interphase are G1, S, and G2
TRUE
A culture of mouse cells is treated with a chemical that interferes with the activity of microfilaments. What would probably be affected the most?
cytokinesis
Human somatic cells are
diploid
Human gametes are
haploid
What is the most significant difference between mitosis and meiosis?
homologous pairs of chromosomes are split up in meiosis
Crossing over is
important in genetic recombination
Halves the number of chromosomes in cellss
meiosis
Which type of human cell would be unlikely to divide?
muscle cell
Disorders involving unusual numbers of sex chromosomes show that "maleness" is caused by
presence of a Y chromosome
Carry information for the same characteristics at corresponding locations
two chromosomes of a homologous pair
The extra chromosome in down syndrome usually comes from the egg, rather than the sperm, because
probability of Down syndrome increases with age of mother
In telophase of mitosis, the mitotic spindle breaks down and nuclear envelopes form. This is essentially the opposite of what happens in...
prophase
When does crossing over occur?
prophase 1
What is produced during the S phase between cell divisions?
sister chromatids
Who carries the same genetic information?
sister chromatids
Which cells undergo Meiosis?
sperm cells
Cytokinesis begins in what phase?
telophase
What happens in Interphase?
the DNA makes a copy of itself
A zoologist examined an intense 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 ovary?
100 chromosomes, each consisting of one chromatid
If there are 22 chromosomes in the nucleus of a toad skin cell, a toad egg would contain how many chromosomes?
11
A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain altogether?
92
Occurs directly after metaphase
anaphase