Ch 9-12

Question 0

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.

Answer 0

16:16

Question 1

If there are 20 chromatids in a cell, how many centromeres are there?

Answer 1

10

Question 2

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…

Answer 2

G1

Question 3

Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?

Answer 3

Golgi derived vesicles

Question 4

1. Genetics
2. Heredity
3. Variation

A. Differences that offspring show from parents & siblings

B. Transmission of traits to next generation

C. Study of heredity

Answer 4

1-C
2-B
3-A

Question 5

The human genome is minimally contained in where?

Answer 5

Every human cell

Question 6

What defines a genome?

Answer 6

The complete set of an organisms genes

Question 7

At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?

Answer 7

Metaphase

Question 8

Why did the F1 offspring of Mendel’s classic pea cross always look like one of the two parental varieties?

Answer 8

One phenotype was completely dominant over another

Question 9

Why did Mendel continue some of his experiments to the F2 or F3 generation?

Answer 9

To observe whether or not a recessive trait would reappear

Question 10

How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

Answer 10

8

Question 11

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?

Answer 11

1/2

Question 12

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?

Answer 12

0

Question 13

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?

Answer 13

Darwin’s explaination of natural selection

Question 14

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?

Answer 14

The gene involved is in the X chromosome

Question 15

SRY is best described in which way?

Answer 15

A gene region present on the Y chromosome that triggers male development

Question 16

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?

Answer 16

XCXc and XCY

Question 17

At which phase(s) is it preferable to obtain chromosomes to prepares karyotype?

Answer 17

Late prophase or metaphase

Question 18

1. Gene
2. Allele
3. Locus
4. Mutation
   A. Alternative version of a gene
   B. Sequence of DNA encoding a protein
   C. Change in the nucleotide sequence
   D. Location of gene

Answer 18

1B 2A 3D 4C

Question 19

The chromosomes each have two chromatids joined at the centromere. What process led to the formation of the two chromatids?

Answer 19

The two chromatids were formed by replication of the DNA within a single chromatid during S phase

Question 20

Diploid cells may undergo either mitosis or meiosis. Can haploid cells?

Answer 20

No

Question 21

A cross between homozygous purple-flowered and homozygous white flowered pea plants results in offspring with purple flowers. This demonstrates?

Answer 21

Dominance

Question 22

Mendel’s observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?

Answer 22

Anaphase 1 of meiosis

Question 23

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?

Answer 23

IB i

Question 24

What is true breeding?

Answer 24

A kind of breeding in which the parents with a particular phenotype produce offspring only with the same phenotype.

Question 25

What is hybridization?

Answer 25

Offspring resulting from the cross between parents of different species

Question 26

What’s is a monohybrid cross?

Answer 26

Mating between individuals who have different alleles at one genetic locus of interest

Question 27

What is a dihybrid cross?

Answer 27

Cross between F1 offspring of two individuals that differ in two traits of particular interest

Question 28

What’s Mendel’s law of segregation?

Answer 28

The two members of a gene pair segregate from each other in the formation of gametes

Question 29

Mendel’s law of independent assortment

Answer 29

Allele pairs separate independently during the formation of gametes

Question 30

What’s pleiotropy?

Answer 30

Occurs when one gene influences multiple, unrelated phenotypic traits.

Question 31

How do haploid and diploid cells differ?

Answer 31

Diploid - 2 complete sets of chromosomes, reproduce by mitosis making daughter cells that are exact replicas. Somatic cells.

Haploid - one complete set of chromosomes. Result of meiosis. Sexual reproduction (gametes)

Question 32

What are autosomes?

Answer 32

The first 22 pairs of chromosomes that do not determine the sex

Question 33

Sex chromosome

Answer 33

23rd pair of chromosome that determines the sex