Ch 13

Question 1

What is a genome?

Answer 1

A) the complete compliment of an organism’s genes.

Question 2

which of the following statements about genes is incorrect?

Answer 2

D) one gene only is used in a specific cell type.

Question 3

Asexual reproduction and sexual reproduction differ in all but which of the following ways?

Answer 3

E) asexual reproduction is utilized only by fungi and protists, whereas sexual reproduction is utilized only by plants and animals.

Question 4

If a horticulturist breeding gardenias succeeds in having a single plant with particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a lot of plants?

Answer 4

C) Clone that plant asexually to produce an identical one

Question 5

Asexual reproduction results in identical offspring unless which of the of the following occurs?

Answer 5

D) mutation

Question 6

The human genome is minimally contained in which of the following?

Answer 6

A) every human cell

Question 7

A gene is location along a chromosome is known as which of the following?

Answer 7

C) locus

Question 8

What is a karyotype?

Answer 8

E)A display of every pair of homologous chromosomes within a cell, organized according to size and shape

Question 9

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

Answer 9

B) metaphase

Question 10

The human X and Y chromosomes

Answer 10

D) D) include genes that determine an individual’s sex

Question 11

Which of the following is true of a species that has a chromosome number of 2n = 16?

Answer 11

C) each cell has eight homologous pairs

Question 12

Eukaryotic sexual life cycle show tremendous variation. Of the following elements, which do all sexual life cycles have in common?
I. Alteration of generations
II. Meiosis
III. Fertilization
IV. Gametes
V. Spores

Answer 12

C) II, III, and IV

Question 13

Which of these statements is false?

Answer 13

D) at sexual maturity, ovaries and testes produce diploid gametes by meiosis.

Question 14

And animals, meiosis results in gametes, and fertilization results in

Answer 14

C) zygotes

Question 15

Referring to a plant sexual life cycle, which of the following terms describes the process that leads directly to the formation of gametes?

Answer 15

B) gametophyte mitosis

Question 16

Which of the following is an example of alteration of generations?

Answer 16

B) a diploid plan (sporophyte) produces, but I’m meiosis, a spore that gives rise to a multicellular, Haploid pollen grain (gametophyte).

Question 17

The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this era would be a mistake and which of the following?

Answer 17

E) either anaphase one or two

Question 18

A given organism has 46 chromosomes and it’s Cara type. We can therefore conclude which of the following?

Answer 18

E) its gametes must have 23 chromosomes.

Question 19

A karyotype results from which of the following?

Answer 19

C) the ordering of human chromosome images

Question 20

After tela phase 1 of meiosis, the commas I’m a make up of each daughter cell is

Answer 20

D) haploid, and the chromosomes are each composed of two chromatids.

Question 21

When does the synaptonemal complex disappear?

Answer 21

A) wait prophase of meiosis one

Question 22

Which of the following happens at the conclusion of meiosis one?

Answer 22

A) homologous chromosomes are separated

Question 23

Chaismata are what we see under a microscope that let us know which of the following is occurring?

Answer 23

D) crossing over

Question 24

How does the sexual life cycle increase the genetic variation of a species?

Answer 24

A) by allowing independent assortment of chromosomes

Question 25

For species with the haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes?

Answer 25

E) about 8 million

Question 26

Independent assortment of chromosomes is a result of

Answer 26

A) the random an independent way in which each pair of Magus chromosomes line up at the metaphase plate during meiosis one.

Question 27

When pairs of homologous chromosomes separate during anaphase I,

Answer 27

B) the sister chromatids remain attached to one another.

Question 28

Natural selection and recombination dude crossing over during meiosis I are related and which of the following ways?

Answer 28

D) recombinants may have combinations of traits that are favored by natural selection.

Question 29

A human cell containing 22 artisans and a Y chromosome is

Answer 29

A) a sperm.

Question 30

Which lifecycle stage is found in plants but not animals?

Answer 30

D) multicellular haploid

Question 31

I'm August chromosomes move toward opposite poles of a dividing cell during

Answer 31

B) meiosis I.

Question 32

Meiosis II is similar to mitosis in that

Answer 32

A) sister chromatids separate during anaphase.

Question 33

If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I would be

Answer 33

D) 2x.

Question 34

If we continue to follow the cell lineage for the previous question, then the DNA content of a single cell at metaphase of meiosis II would be

Answer 34

C) x.

Question 35

How many different combinations of maternal and paternal chromosomes can be packaged in gametes made by an organism with a diploid number of 8(2n = 8)?

Answer 35

D) 16