Mitosis and Meiosis biology

C. Meiosis 1
Alleles for the same trait separate during

a. fertilization
b. mitosis
c. meiosis 1
d. meiosis 2

C. 24
If an organism has 24 chromosomes in its autosomal cells, its diploid (2N) number is

a. 6
b. 12
c. 24
d. 48

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A. Phenotype
The physical appearance of an individual is its

a. phenotype
b. geneotype
c. heredity
d. genetics

B. Chromatids
A tetrad consists of 4

a. alleles
b. chromatids
c. homologues
d. homologous chromosomes

B. One ovum is formed
In the formation of gametes from a single cell

a. one sperm cell is formed
b. one ovum is formed
c. two ovaries are formed
d. four egg cells are formed

B. Crossing over
Homologous chromosomes may exchange portions of other chromatids in

a. haploid cells
b. crossing over
c. mitosis
d. meiosis 2

D. Be produced by meiosis
To maintain the chromosome number in an organism, the gametes must

a. become diploid
b. become recessive
c.be produced by mitosis
d. be produced by meiosis

D. Alleles
Different forms of a gene are

a. haploid
b. linked
c. homologues
d. alleles

D. During Prophase 1
Homologous chromosomes pair

a. at the end of meiosis 1
b. at the beginning of meiosis 2
c. during mitosis
d. during prophase 1

D. Four unlike gamete cells
Unlike mitosis, meiosis of a single cell results in the formation of

a. two identical cells
b. three identical haploid polar bodies
c. four identical gamete cells
d. four unlike gamete cells

B. The first meiotic division
In meiosis, homologous chromosomes are separated during

a. interphase 1
b. the first meiotic division
c. interphase 2
d. the second meiotic division

C. The same size
Compared with the cells of a baby the cells of an adult are

a. larger
b. smaller
c. the same size
d. less numorous

D. DNA
Which term includes the others

a. chromosomes
b. histones
c. proteins
d. DNA

D. Is longer than the chromosome itself
Scientists reasoned that DNA in chromosomes must be folded because the DNA

a. is a double helix
b. is shorter than the chromatid
c. is combined with special proteins
d. is longer than the chromosome itself

A. 46 chromosomes
As a result of mitosis in a human body cell. the nucleus of each daughter cell contains

a. 46 chromosomes
b. 92 chromosomes
c. 23 chromosomes
d. 36 chromosomes

C. Histones
The DNA of chromosomes is coiled around special proteins called

a. nucleosomes
b. chromatids
c. histones
d. chromatin

D. Condensing of the chromatin
During mitosis, chromosomes become visible as a result of the

a. formation of the spindle
b. destruction of the nuclear membrane
c. duplication of the centromere
d. condensing of the chromatin

B. Centromere
Each pair of chromatids is attached at an area called

a. chromosome
b. centromere
c. kinetochore
d. both B and C

C. Interphase
Which of the following terms contains the others?

a. g1 phase
b. g2 phase
c. interphase
d. s phase

D. Microtubules
The spindle and the centriole are composed of

a. RNA
b. chromatin
c. histones
d. microtubules

D. Only during mitosis
In most cells, chromosomes are visible with a light microscope

a. throughout the cell cycle
b. throughout g1 and g2 phases
c. only during synthesis
d. only during mitosis

B. Spindle
The mesh-like structure that helps move the chromosomes apart during mitosis is called the

a. centriole
b. spindle
c. aster
d. nucleosome

A. Nucleosomes
The beadlike structures in chromosomes that cause increased coiling are the

a. nucleosomes
b. histones
c. chromatin
d. DNA

D. Telophase
Cytokenisis quickly follows

a. anaphase
b. prophase
c. metaphase
d. telophase

B. Sister chromosomes
At the beginning of mitosis, a chromosome consists of two

a. centromeres
b. sister chromatids
c. nucleosomes
d. nuclei

C. Contact inhibition
A factor involved in control of the cell cycle is

a. selective permeability
b. cytoplasmic density
c. contact inhibition
d. conductivity

D. Lining up of the chromosomes in the cell
By the end of prophase each of the following has correctly occurred except

a. tighter coiling of the chromosomes
b. breaking down of the nuclear envelope
c. disappearing of the nucleus
d. lining up of the chromosomes in the cell

D. Chromosome
Tangled strands of DNA wrapped around protein molecules make up the

a. spindle
b. microtubules
c. nuclear envelope
d. chromosome

B. Interphase
The longest phase in the cell cycle is

a. prophase
b. interphase
c. metaphase
d. mitosis

C. Genetic recombination
Crossing over results in

a. female genotype
b. male genotype
c. genetic recombination
d. phenotype replication

B. Genes
The chemical factors that determine traits are called

a. alleles
b. genes
c. traits
d. characters

D. 2X
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 1 would be

a. .25X
b. .5X
c. X
d. 2X
e. 4X

B. N
The number of chromosomes in a gamete is represented by the symbol

a. Z
b. N
c. X
d. Y

C. 6
If an organism’s diploid number is 12, its haploid number is

a. 12
b. 24
c. 6
d. 3

D. One allele for each gene
Gametes have

a. homologous chromosomes
b.twice the number of chromosomes found in the body cells
c. two sets of chromosomes
d. one allele for each gene

C. meiosis
Gametes are produced by the process of

a. mitosis
b. crossing over
c. meiosis
d. mitosis

A. prophase 1 of meiosis
Chromosomes form tetrads during

a. prophase 1 of meiosis
b. interphase
c. metaphase 1 of meiosis
d. anaphase 2 of meiosis

D. Replication does not occur
What happens between meiosis 1 and meiosis 2 that reduces the number of chromosomes?

a. crossing over occurs
b. replication occurs twice
c. metaphase occurs
d. replication does not occur

C. Haploid cells
Unlike mitosis, meiosis results in the formation of

a. diploid cells
b. 2N daughter cells
c. haploid cells
d. body cells`

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