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Biology chapter 10

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1

Part A Which of the following occurs during meiosis but not during mitosis?

A) chromosome replication
B) synapsis occurs
C) production of daughter cells
D) alignment of chromosomes at the equator
E) condensation of chromatin

B. Synapsis occurs

2

In alternation of generations, what is the diploid stage of a plant that follows fertilization called?

Sporophyte

3

Identify all possible products of meiosis in plant and animal life cycles.

Gametes

Spores

Multicellular adult organisma

Spores and gametes

4
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Look at the cell in the figure. Based on this figure, which of the following statements is true?

It is impossible to tell whether the cell is haploid or diploid.

This cell is diploid.

This cell is haploid.

The cell is diploid

5
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What is the best evidence telling you whether this cell is diploid or haploid?

The cell is haploid because the chromosomes are not found in pairs.

The cell is diploid because it contains two sets of chromosomes.

The cell is diploid because each chromosome consists of two chromatids

the cell is diploid because it contains two sets of chromosomes

6
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This chromosome has two chromatids, joined at the centromere. What process led to the formation of the two chromatids?

The two chromatids were formed by synapsis and the formation of a synaptonemal complex.

The two chromatids were formed by fertilization, bringing together maternal and paternal chromatids.

The two chromatids were formed by duplication of a chromosome.

The two chromatids were formed by the duplication of a chromosome

7

Two sister chromatids are joined at the centromere prior to meiosis. Which statement is correct

These chromatids make up a diploid chromosome.

The cell that contains these sister chromatids must be haploid.

Barring mutation, the two sister chromatids must be identical.

barring mutation the two sister chromatids must be identical

8

Asexual reproduction _____.

is limited to plants

produces offspring genetically identical to the parent

is limited to single-cell organisms

requires both meiosis and mitosis

leads to a loss of genetic material

produces offspring genetically identical to the parent

9

What number and types of chromosomes are found in a human somatic cell?

n chromosomes

44 autosomes and 2 sex chromosomes

22 autosomes and 1 sex chromosome

21 autosomes and 2 sex chromosomes

45 autosomes and 1 sex chromosome

44 autosomes and 2 sex chromosomes

10

For what purpose(s) might a karyotype be prepared?

for prenatal screening, to determine if a fetus has the correct number of chromosomes

to determine whether a fetus is male or female

to detect the possible presence of chromosomal abnormalities such as deletions, inversions, or translocations

The first and second answers are correct.

The first three answers are correct.

The first three answers are correct

11

How are sister chromatids and homologous chromosomes different from each other?

They are not different. Homologous chromosomes and sister chromatids are both identical copies of each other.

Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene.

Sister chromatids are identical copies of each other produced during DNA replication.

Homologous chromosomes are identical copies of each other. One sister chromatid comes from the father, and one comes from the mother.

Sister chromatids are only formed during mitosis. Homologous chromosomes are formed during meiosis.

Homologous chromosomes are closely associated with each other in both mitosis and meiosis. Sister chromatids are only associated with each other during mitosis.

Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication

12

Mitosis results in the formation of how many cells; meiosis results in the formation of how many cells?

four diploid cells ... four haploid cells

two diploid cells ... two haploid cells

four haploid cells ... two diploid cells

two diploid cells ... four haploid cells

two diploid cells ... two diploid cells

2 dipoid...4 haploid

13

What is crossing over?

the movement of genetic material from one chromosome to a nonhomologous chromosome

making an RNA copy of a DNA strand

the exchange of homologous portions of nonsister chromatids

a direct consequence of the separation of sister chromatids

also referred to as the "independent assortment of chromosomes"

The exchange of homologous portions of nonsister chromatids

14

Heritable variation is required for which of the following?

the production of a clone

meiosis

evolution

asexual reproduction

mitosis

evolution

15

A human cell containing 22 autosomes and a Y chromosome is

a somatic cell of a male.

a somatic cell of a female.

an egg.

a zygote.

a sperm.

A sperm

16

Homologous chromosomes move toward opposite poles of a dividing cell during

fertilization

. binary fission

meiosis II.

mitosis.

meiosis I.

meiosis I

17

Which sample(s) of DNA might be from a nerve cell arrested in G0 of the cell cycle?

I

18

Which sample(s) might represent an animal cell in the G2 phase of the cell cycle?

II

19

Which sample(s) might represent a zygote?

I


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