Ch 9-12 Flashcards
(34 cards)
A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. Those cells would have ____ picograms at the end of the S phase and ____ picograms at the of G2.
16:16
If there are 20 chromatids in a cell, how many centromeres are there?
10
A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in…
G1
Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?
Golgi derived vesicles
- Genetics
- Heredity
- Variation
A. Differences that offspring show from parents & siblings
B. Transmission of traits to next generation
C. Study of heredity
1-C
2-B
3-A
The human genome is minimally contained in where?
Every human cell
What defines a genome?
The complete set of an organisms genes
At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
Metaphase
Why did the F1 offspring of Mendel’s classic pea cross always look like one of the two parental varieties?
One phenotype was completely dominant over another
Why did Mendel continue some of his experiments to the F2 or F3 generation?
To observe whether or not a recessive trait would reappear
How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?
8
Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of crosses Bbtt x BBtt will be expected to have black fur and long tails?
1/2
In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short?
0
The frequency of heterozygosity for the sickle cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Such a relationship is related to?
Darwin’s explaination of natural selection
When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red-eyed and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result?
The gene involved is in the X chromosome
SRY is best described in which way?
A gene region present on the Y chromosome that triggers male development
Red-green color blindness is a sex linked recessive trait in humans. Two people with normal color vision have color blind son. What are the genotypes of the parents?
XCXc and XCY
At which phase(s) is it preferable to obtain chromosomes to prepares karyotype?
Late prophase or metaphase
- Gene
- Allele
- Locus
- Mutation
A. Alternative version of a gene
B. Sequence of DNA encoding a protein
C. Change in the nucleotide sequence
D. Location of gene
1B 2A 3D 4C
The chromosomes each have two chromatids joined at the centromere. What process led to the formation of the two chromatids?
The two chromatids were formed by replication of the DNA within a single chromatid during S phase
Diploid cells may undergo either mitosis or meiosis. Can haploid cells?
No
A cross between homozygous purple-flowered and homozygous white flowered pea plants results in offspring with purple flowers. This demonstrates?
Dominance
Mendel’s observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?
Anaphase 1 of meiosis
A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. What is a possible partial genotypes for the son?
IB i
