Genetics chp 2
In a healthy female, how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies would be expected from 100 primary oocytes? A) 200; 50 B) 100; 50 C) 200; 300 D) 100; 100 E) 50; 50
100,100
For the purposes of this question, assume that a G1 somatic cell nucleus in a female Myrmecia pilosula contains 2 picograms of DNA. How much DNA would be expected in a metaphase I cell of a female? A) 16 picograms B) 32 picograms C) 8 picograms D) 4 picograms E) Not enough information is provided to answer the question.
16 picograms
How many haploid sets of chromosomes are present in a diploid individual cell with a chromosome number of 46? 32?
2,2
The house fly, Musca domestica, has a haploid chromosome number of 6. How many chromatids should be present in a diploid, somatic, metaphase cell?
24
Myrmecia pilosula actually consists of several virtually identical, closely related species, with females having chromosome numbers of 18, 20, 32, 48, 60, 62, and 64. Assume one crossed a female of species (A) with 32 chromosomes and a male of species (B) with 9 chromosomes (males are haploid, and each gamete contains the n complement). How many chromosomes would one expect in the body (somatic) cells of the female offspring? A) 4.5 B) 9 C) 25 D) 32 E) 41
25
In an organism with 52 chromosomes, how many bivalents would be expected to form during meiosis? A) 13 B) 26 C) 52 D) 104 E) 208
26
If a typical somatic cell has 64 chromosomes, how many chromosomes are expected in each gamete of that organism? A) 8 B) 16 C) 32 D) 64 E) 128
32
How many haploid sets of chromosomes are present in an individual cell that is tetraploid (4n)?
4
Homologous chromosomes are those that can be matched by virtue of their similar structure and function within a nucleus. Which chromosomes making up a genome do not follow the same characteristics of homology?
: sex-determining chromosomes
Regarding the mitotic cell cycle, what is meant by a checkpoint?
A checkpoint is the portion of a cell cycle that is sensitive to a variety of conditions that impact the eventual health of the cell or individual. Such checkpoints often restrict passage to the next event in the cell cycle.
Assume that the somatic cells of a male contain one pair of homologous chromosomes (e.g., AaAb), and an additional chromosome without a homolog (e.g., W). What chromosomal combinations would be expected in the meiotic products (spermatids) of a single primary spermatocyte? (There may be more than one answer.)
AaW, AaW, Ab, Ab or Aa, Aa, AbW, AbW
During interphase of the cell cycle, ________. A) DNA recombines B) sister chromatids move to opposite poles C) the nuclear membrane disappears D) RNA replicates E) DNA content essentially doubles
DNA content
What is meant by the term chiasma?
What is meant by the term chiasma?
In a healthy male, how many sperm cells would be expected to be formed from (a) 400 primary spermatocytes? (b) 400 secondary spermatocytes? A) (a) 800; (b) 800 B) (a) 1600; (b) 1600 C) (a) 1600; (b) 800 D) (a) 400; (b) 400 E) (a) 100; (b) 800
a,1600 b,800
Name two cellular organelles, each having genetic material, that are involved in either photosynthesis or respiration
chloroplasts and mitochondria
During meiosis, chromosome number reduction takes place in anaphase II
false
When cells withdraw from the continuous cell cycle and enter a "quiescent" phase, they are said to be in what stage
g0
In which stage of the cell cycle is G0 located?
g1
After which meiotic stage (meiosis I or II) would one expect monads to be formed?
meiosis II
List four terms used to describe the normal morphologies, with respect to arm ratio, of eukaryotic chromosomes.
metacentric, submetacentric, acrocentric, telocentric
The nucleolus organizer (NOR) is responsible for production of what type of cell structure?
ribosome
What is the outcome of synapsis, a significant event in meiosis? A) side-by-side alignment of nonhomologous chromosomes B) dyad formation C) monad movement to opposite poles D) side-by-side alignment of homologous chromosomes E) chiasma segregation
side-by-side
) If a typical G1 nucleus is 2n and contains 2C (two complements) of DNA, a prophase I cell is 2n and contains 4C of DNA
true
A bivalent at pachytene contains four chromatids.
true
An organism with a diploid chromosome number of 46 will produce 223 combinations of chromosomes at the end of meiosis.
true
If a typical G1 nucleus contains 2C (two complements) of DNA, a gamete that is haploid (n) contains 1C of DNA
true
S phase is the part of interphase when DNA duplication takes place.
true
The centromere of a chromosome separates during anaphase
true
The meiotic cell cycle involves two cell divisions but only one DNA replication
true
A chromosome may contain one or two chromatids in different phases of the mitotic or meiotic cell cycle.
ture
An organism with a haploid number of 10 will produce 1024 combinations of chromosomes at the end of meiosis
ture