Name_____________________________
Ch 8,9,10 Quiz
1. Compare and contrast cytokinesis in plants and animals (1)
In plants cytokinesis happens by vacuoles containing cell wall material gathering at the
middle of the cell and forming a cell plate. They fuse together an d eventually fuse with
the cell wall, creating two new cells.
In animals cytokinesis happens via cleavage. A cleavage furrow appears, which is a
shallow groove on the cell surface. Microfilaments form a ring at the site and contract
deepening the furrow and splitting the cell in two new cells.
2. Explain the difference between haploid and diploid, in terms of chromosomes number
as compared to a parent cell. Which specific cells in our body are haploid and which are
diploid?
(1)
Haploid is when the daughter cell has half the number of chromosomes as found in the
parent cells. There are only chromosomes from the mother or the father. Diploid is when
the cell has the same number of chromosomes as found in the parent cell. There are
chromosomes from the mother and the father. Somatic cells are diploid and gametes are
haploid.
3. In cells during division, at which phase….. (fill in an answer for each one) (1)
A. do cells grow and copy DNA?- Interphase
B. are sister chromatids split and moved to opposite poles?- Anaphase
C. do chromosomes line up on a plane located equidistant from the two spindle
poles?- metaphase
4. How does meiosis differ from mitosis? (1)
Mitosis and meiosis differ in that mitosis involved a single cell division whereas meiosis
involved two cell divisions. Mitosis results in 2 daughter cells that are identical to the
parent. Meiosis results in 4 daughter cells, not identical to the parent.
5. Homologous chromosomes are….. (select one) (1)
A. Identical chromosomes present in twins
B. Two chromosomes carrying the genes for the same characteristic at the
same loci
C. Two chromosomes carrying the same gene for the same characteristic at
different loci
D. Two sex chromosomes found in the same place at the same time
6. Hitchhiker’s thumb is a recessive trait. If an individual who is heterozygous for that
trait mates with a homozygous recessive individual, what is the probability of their
offspring having hitchhiker’s thumb? Show the Punnett square in addition to your
answer. (2 pts)
h
h
H
Hh
Hh
h
hh
hh
There is a 50% chance that their offspring will be heterozygous. There is a 50% change
that their offspring will be homozygous recessive. There is a 50% chance their children
will have hitchhikers thumb and a 50% chance that they will only be carriers.
7. DNA is synthesized in which direction (on the daughter strand)? (1 pts)
A) 3’  5’
B) 3’  3’
C) 5’  5’
D) 5’  3’
E) Not enough information is given.
8. We talked about three enzymes involved in the process of DNA Replication. Name
them AND describe their function(s). ***Remember that enzymes end in the letters –ase
(2)
Helicase- unwinds the DNA double helix
Polymerase- adds nucleic acids and synthesized the daughter strands
Ligase- connects the fragments of DNA on the lagging strand.