Bio 3 Ch. 9 Review

16

How many possible gametes are there if a cell has 4 chromosome pairs? A) 32 B) 16 C) 8 D) 4 E) Impossible to determine.

synapsis and crossing over occurs

If asked whether a cell was in prophase I or prophase II, you could diagnose the former by finding A) synapsis and crossing over occurs B) the spindle forms C) the nucleolus disappears D) chromosomes coil E) the nuclear membrane disappears

haploid; diploid

In humans, gametes are ________ and somatic cells are ________. A) triploid; haploid B) haploid; haploid C) diploid; diploid D) haploid; diploid E) haploid; triploid

the ovaries and testes

In humans, germ-line cells are located in A) the kidneys B) the brain C) the muscle cells D) the eyes E) the ovaries and testes

haploid

Many protists are ________ for most of their lives. A) haploid B) diploid C) germ-line D) cross overs E) All of the answer choices are correct

during interphase

Duplication of DNA occurs A) twice, before meiosis I and meiosis II B) during prophase I C) during interphase D) before meiosis II only E) All of the answer choices are correct

independent assortment

During metaphase I of meiosis, homologous chromosomes can orient themselves such that one or the other will by chance go to a particular daughter cell in a process known as ________.

Anaphase I

When does separation of homologous chromosomes occur? A) Anaphase I B) Prophase I C) Interphase D) Anaphase II E) Metaphase I

van Beneden

Which scientist is credited with proposing in 1887 that an egg and a sperm fuse to form a zygote? A) van Beneden B) Fleming C) Watson D) Crick E) Muller

mitotic

A person who was looking at unlabelled slides might easily confuse the second meiotic division with a ________ division.

sexual reproduction

A pesticide which attacks meiosis will only injure insects going through a ________ life cycle.

2; 4

After meiosis I ________ cells are formed and after meiosis II, ________ cells result. A) 2; 8 B) 4; 4 C) 4; 8 D) 2; 4 E) 2; 3

synapsis

All of the following are sources of genetic variation except A) independent assortment at metaphase I B) crossing over C) random fertilization D) synapsis E) independent assortment at anaphase I

32

An organism's diploid number is 64. Its haploid number would be A) 128 B) 12 C) 64 D) 32 E) It is impossible to determine

Metaphase II

During which stage do chromosomes line up in single file on the equatorial plane? A) Anaphase II B) Metaphase II C) Metaphase I D) Telophase II E) Telophase I

All of the answer choices are correct

Genetic recombination is the result of A) random fertilization with a nonrelated gamete B) crossing over C) independent assortment at metaphase I D) independent assortment at anaphase I E) All of the answer choices are correct

homologous chromosomes; chromatids

In anaphase 1 ________ separate, and in anaphase II ________ separate. A) homologous chromosomes; chromatids B) homologous chromosomes; diploid cells C) chromatids; homologous chromosomes D) chromatids; haploid cells E) haploid cells; diploid cells

mitosis

In plants like the fern, haploid cells produced by meiosis divide by ________ to form a multicellular haploid phase. A) mitosis B) budding C) meiosis D) binary fission E) All of the answer choices are correct.

metaphase I

Independent assortment of homologous chromosomes occurs during A) metaphase II B) interphase C) anaphase II D) prophase I E) metaphase I

crossing over

The exchange of genetic information between homologous chromosomes is known as A) independent assortment B) crossing over C) lining up at the equator D) random fertilization E) fusion

223

The number of different possible gametes that an organism can produce due to independent assortment is 2n, where n is the number of chromosome pairs. How many different kinds of gametes can be produced by humans due to independent assortment only? A) 246 B) 462 C) 232 D) 234 E) 223

is called synapsis

The pairing of homologous chromosomes all along their lengths A) only occurs in mitosis B) occurs during telophase I C) is called synapsis D) occurs during anaphase II E) is called crossing over

the orientation of homologous chromosomes during metaphase I

The process of independent assortment refers to A) whether sexual or asexual reproduction will occur B) the orientation of chromosomes during metaphase II C) the random choice of which cell in germ-line tissue will begin meiosis D) the orientation of homologous chromosomes during metaphase I E) the random meeting of an egg and sperm

meiosis

The process that serves to decrease cellular chromosome number by half is A) meiosis B) binary fission C) both mitosis and meiosis decrease chromosome number by half D) mitosis E) mitosis, meiosis, and binary fission all decrease chromosome number by half

to separate homologous chromosomes

The purpose of meiosis I is A) to repair errors in DNA synthesis B) to separate homologous chromosomes C) to create 4 haploid cells D) to separate sister chromatids E) to replicate chromosomes

zygote

The single cell formed by syngamy, or the fusion of gametes, is called a ________.

crossing over

When nonsister chromatids exchange segments during meiosis, the process is called ________ ________.

Sister chomatids separate in anaphase I

Which is incorrect about meiosis? A) Crossing over occurs in prophase I B) Meiosis I results in two haploid cells C) Sister chomatids separate in anaphase I D) Chromosome replication only occurs in interphase I E) Meiosis II is like mitosis

Because homologous chromosomes are no longer in the same cell

Why is crossing over not possible in meiosis II? A) Because prophase only occurs in meiosis I B) Because the enzymes needed for it to occur are no longer present C) Because meiosis II is much shorter than meiosis I D) Because homologous chromosomes are no longer in the same cell E) None of the answer choices are correct

germ-like

You are examining a newly discovered animal and observe an inability of the organisms to undergo sexual reproduction. All somatic cells are present, but you might see a lack of ________ cells.