Cell Division Notes

Question 1

A cell division in humans is observed. Cells in culture have their 23 total chromosomes (each composed of two sister chromatids) arranged along the equator of the cells. Which phase of the cell cycle is being observed?

Answer 1

Metaphase of mitosis

Question 2

At the beginning of meiosis, there are _____ chromosomes & ________ sister chromatids

Answer 2

46 chromosomes
92 chromatids

Question 3

At the end of meiosis I, each cell has
_____ chromosomes & ______ sister
chromatids (reduction division)

Answer 3

23 chromosomes
46 chromatids

Question 4

At the end of Meiosis II, there are _____
chromosomes & ______ chromatids

Answer 4

23 chromosomes
23 chromatids

Question 5

Several large families which have members afflicted with the same disorder agree to take part in a genetic study. All family members provide DNA and PCR RFLP data is used in an attempt to identify a genomic locus associated with the disorder. What feature of DNA
allows these data to be collected?
A. Telomeric DNA is found on chromosomal ends
B. Restriction enzymes cut at palindromic sequences
C. Introns are spliced from exons during RNA processing
D. All DNA point mutations affect restriction sites
E. Most human genes exhibit alternative splicing
F. DNA is replicated by a semi-conservative mechanism

Answer 5

B. Restriction enzymes cut at palindromic sequences (Restriction length polymorphism)