Question 1

How many total chromatids are found in a human somatic cell nucleus during G2 phase?

Accepted Answer

Question 2

Synapsis initiates formation of a protein bridge called the synaptonemal complex, a tri-layer protein structure that maintains synapsis by tightly binding ________ of homologous chromosomes to one another.

Accepted Answer

nonsister

Question 3

How many DNA molecules are in a somatic cell of the snail in G2 phase?

Accepted Answer

A) 4 
B) 8 
C) 16 
D) too many to count 
A) 4 
B) 8 
C) 16 
D) too many to count

Question 4

During meiosis I, when does homologous chromosome pairing and recombination occur?

Accepted Answer

A) prophase I 
B) pro-metaphase I 
C) metaphase I 
D) anaphase I 
E) telophase I 
A) prophase I 
B) pro-metaphase I 
C) metaphase I 
D) anaphase I 
E) telophase I

Question 5

The gametes of the two sexes are often dramatically different in size and morphology. If both gametes have a haploid nuclei, then what do female gametes contain more of?

Accepted Answer

cytoplasm

Question 6

Morgan's analysis of a white-eyed male Drosophila mutation helped explain __________.

Accepted Answer

A) autosomal dominance 
B) random mutation 
C) crossing over 
D) independent assortment 
E) X-linked inheritance 
A) autosomal dominance 
B) random mutation 
C) crossing over 
D) independent assortment 
E) X-linked inheritance

Question 7

How many homologous pairs of chromosomes are found in a human somatic cell nucleus?

Accepted Answer

The answer of How many homologous pairs of chromosomes are...

Question 8

Which organelle migrates during M phase to form the two opposite poles of the dividing cell and acts as the source of the spindle fiber microtubules?

Accepted Answer

A) centromere 
B) kinetochore 
C) centrosome 
D) chiasmata 
E) chromosome 
A) centromere 
B) kinetochore 
C) centrosome 
D) chiasmata 
E) chromosome

Question 9

Why are chromosomes more easily visible under the microscope during metaphase as compared to G2 phase?

Accepted Answer

They have

Question 10

How many chromosomes are found in a human somatic cell nucleus?

Accepted Answer

The answer of How many chromosomes are found in a...

Question 11

What separates in meiosis I to reduce the diploid number (2n)of chromosomes to the haploid number (n)?

Accepted Answer

homologous

Question 12

A dihybrid has the genotype AaBb. After a normal mitotic division into two daughters cells, one daughter cell will have the genotype _____________ and the other will have the genotype ______________.

Accepted Answer

A) Aa; Bb 
B) AaBb; AaBb 
C) AB; ab 
D) Ab; aB 
E) AABB; aabb 
A) Aa; Bb 
B) AaBb; AaBb 
C) AB; ab 
D) Ab; aB 
E) AABB; aabb

Question 13

Describe how microtubules and cohesion work together to align the chromosomes along the metaphase plate during the process of sister chromatid cohesion.

Accepted Answer

Kinetochore microtubules are attached to

Question 14

Vinblastine is a commonly used chemotherapy drug that acts by interfering with the assembly of microtubules. How does it likely target cancer cells?

Accepted Answer

A) by suppressing cyclins 
B) by inhibiting protein kinases 
C) by inhibiting DNA synthesis 
D) by denaturing myosin and preventing the cleavage furrow from forming 
E) by disrupting mitotic spindle formation 
A) by suppressing cyclins 
B) by inhibiting protein kinases 
C) by inhibiting DNA synthesis 
D) by denaturing myosin and preventing the cleavage furrow from forming 
E) by disrupting mitotic spindle formation

Question 15

What insight did Nettie Stevens's studies of the beetle Tenebrio molitor provide about the chromosome theory of inheritance?

Accepted Answer

A) Genes are located on chromosomes. 
B) The number of autosomal chromosomes varied between gametes. 
C) Crossing over occurs between homologous chromosomes. 
D) Sex is determined by the presence of an X or Y chromosome in the male gamete. 
E) Chromosomes assort independently into the haploid gametes. 
A) Genes are located on chromosomes. 
B) The number of autosomal chromosomes varied between gametes. 
C) Crossing over occurs between homologous chromosomes. 
D) Sex is determined by the presence of an X or Y chromosome in the male gamete. 
E) Chromosomes assort independently into the haploid gametes.

Question 16

Which of the following represents the contents of a cell in G2 phase (before cell division begins)?

Accepted Answer

A) Cell G 
B) Cell H 
C) Cell K 
D) Cell M 
E) Cell P 
A) Cell G 
B) Cell H 
C) Cell K 
D) Cell M 
E) Cell P

Question 17

Mutations that inhibit Rb gene expression will have what effect on cell proliferation?

Accepted Answer

A) Cells will proliferate less, even if excess growth factors are present. 
B) Cells will proliferate less because growth factors are absent. 
C) Cells will proliferate more because growth factors are produced in excess. 
D) Cells will proliferate more, regardless of growth factor concentration. 
E) There will be no effect on cell proliferation; only apoptosis occurs. 
A) Cells will proliferate less, even if excess growth factors are present. 
B) Cells will proliferate less because growth factors are absent. 
C) Cells will proliferate more because growth factors are produced in excess. 
D) Cells will proliferate more, regardless of growth factor concentration. 
E) There will be no effect on cell proliferation; only apoptosis occurs.

Question 18

Scientists isolate two different cells from the same organism at different points in the cell cycle. Cell A has 1.5 times the DNA content of cell B. Which of the following is true?

Accepted Answer

A) cell A is in G1 phase; cell B is in G2 phase 
B) cell B is in G1 phase; cell A is in G1 phase 
C) cell A is in S phase; cell B is in G1 phase 
D) cell B is in S phase; cell A is in G1 phase 
E) cell A is in S phase; cell B is in G2 phase 
A) cell A is in G1 phase; cell B is in G2 phase 
B) cell B is in G1 phase; cell A is in G1 phase 
C) cell A is in S phase; cell B is in G1 phase 
D) cell B is in S phase; cell A is in G1 phase 
E) cell A is in S phase; cell B is in G2 phase

Question 19

Red-green color blindness is an X-linked recessive disorder. A woman with normal vision whose father was colorblind has children with a man with normal color vision. What is the probability that their first child will be colorblind?

Accepted Answer

A) 1/4 
B) 1/2 
C) 3/4 
D) 0 
E) 1 
A) 1/4 
B) 1/2 
C) 3/4 
D) 0 
E) 1

Question 20

Bridges showed that sex determination in Drosophila meant that __________.

Accepted Answer

A) females were XX or XXX, and males were XY or XXY 
B) females were XX, and males were XY 
C) females were XX, and males were XY or XO 
D) females were XX or XXX, and males were XY or XO 
E) females were XX or XO, and males were XY or XXY 
A) females were XX or XXX, and males were XY or XXY 
B) females were XX, and males were XY 
C) females were XX, and males were XY or XO 
D) females were XX or XXX, and males were XY or XO 
E) females were XX or XO, and males were XY or XXY

Exam 3: Cell Division and Chromosome Heredity

How many total chromatids are found in a human somatic cell nucleus during G2 phase?

Synapsis initiates formation of a protein bridge called the synaptonemal complex, a tri-layer protein structure that maintains synapsis by tightly binding ________ of homologous chromosomes to one another.

How many DNA molecules are in a somatic cell of the snail in G2 phase?

During meiosis I, when does homologous chromosome pairing and recombination occur?

The gametes of the two sexes are often dramatically different in size and morphology. If both gametes have a haploid nuclei, then what do female gametes contain more of?

Morgan's analysis of a white-eyed male Drosophila mutation helped explain __________.

How many homologous pairs of chromosomes are found in a human somatic cell nucleus?

Which organelle migrates during M phase to form the two opposite poles of the dividing cell and acts as the source of the spindle fiber microtubules?

Why are chromosomes more easily visible under the microscope during metaphase as compared to G2 phase?

How many chromosomes are found in a human somatic cell nucleus?

What separates in meiosis I to reduce the diploid number (2n)of chromosomes to the haploid number (n)?

A dihybrid has the genotype AaBb. After a normal mitotic division into two daughters cells, one daughter cell will have the genotype _____________ and the other will have the genotype ______________.

Describe how microtubules and cohesion work together to align the chromosomes along the metaphase plate during the process of sister chromatid cohesion.

Vinblastine is a commonly used chemotherapy drug that acts by interfering with the assembly of microtubules. How does it likely target cancer cells?

What insight did Nettie Stevens's studies of the beetle Tenebrio molitor provide about the chromosome theory of inheritance?

Which of the following represents the contents of a cell in G2 phase (before cell division begins)?

Mutations that inhibit Rb gene expression will have what effect on cell proliferation?

Scientists isolate two different cells from the same organism at different points in the cell cycle. Cell A has 1.5 times the DNA content of cell B. Which of the following is true?

Red-green color blindness is an X-linked recessive disorder. A woman with normal vision whose father was colorblind has children with a man with normal color vision. What is the probability that their first child will be colorblind?

Bridges showed that sex determination in Drosophila meant that __________.

The Molecular Basis of Heredity, Variation, and Evolution

Transmission Genetics

Gene Interaction

Genetic Linkage and Mapping in Eukaryotes

Genetic Analysis and Mapping in Bacteria and Bacteriophages

Dna Structure and Replication

Molecular Biology and Transcription and Rna Processing

The Molecular Biology of Translation

The Integration of Genetic Approaches: Understanding Sickle Cell Disease

Chromosome Structure

Gene Mutation, Dna Repair, and Homologous Recombination

Chromosome Aberrations and Transposition

Regulation of Gene Expression in Bacteria and Bacteriophages

Regulation of Gene Expression in Eukaryotes

Forward Genetics and Recombinant Dna Technology

Applications of Recombinant Dna Technology and Reverse Genetics

Genomics: Genetics From a Whole-Genome Perspective

Cytoplasmic Inheritance and the Evolution of Organelle Genomes

Developmental Genetics

Genetic Analysis of Quantitative Traits

Population Genetics and Evolution

Filters

How many total chromatids are found in a human somatic cell nucleus during G₂ phase?

How many DNA molecules are in a somatic cell of the snail in G₂ phase?

Why are chromosomes more easily visible under the microscope during metaphase as compared to G₂ phase?

A dihybrid has the genotype AaBb. After a normal mitotic division into two daughters cells, one daughter cell will have the genotype _ and the other will have the genotype __.

Which of the following represents the contents of a cell in G₂ phase (before cell division begins)?