Question 1

The synaptonemal complex becomes fully developed during which stage of prophase I?

Accepted Answer

A) leptotene 
B) zygotene 
C) pachytene 
D) diplotene 
E) diakinesis 
A) leptotene 
B) zygotene 
C) pachytene 
D) diplotene 
E) diakinesis

Question 2

Which of the following applies to organisms,particularly plants and fungi,that have distinct haploid and diploid phases of their life cycles?

Accepted Answer

A) polyploidy 
B) aneuploidy 
C) alternation of generations 
D) asexual propagation 
E) regeneration 
A) polyploidy 
B) aneuploidy 
C) alternation of generations 
D) asexual propagation 
E) regeneration

Question 3

A black Labrador retriever named JD is heterozygous (Bb)for coat color (B = black and b = brown).Bb is JD's

Accepted Answer

A) genotype. 
B) heterozygous state. 
C) gene conversion state. 
D) phenotype. 
E) homozygous state. 
A) genotype. 
B) heterozygous state. 
C) gene conversion state. 
D) phenotype. 
E) homozygous state.

Question 4

________ is the term used to describe the condition of a cell containing a chromosome number that is not a multiple of the haploid number.

Accepted Answer

The answer of ________ is the term used to describe...

Question 5

Individuals with Turner syndrome (monosomy X)have only one sex chromosome-a single X chromosome.Such individuals are produced when nondisjunction results in a gamete with no sex chromosome,which subsequently fuses with a normal gamete.What would be the sex chromosome complement of an individual produced by fusion of a normal gamete with the gamete that ended up with the extra chromosome missing from the Turner syndrome patient?

Accepted Answer

A) XXX 
B) XXY 
C) XYY 
D) XY 
E) Either A or B would be a possible chromosome complement. 
A) XXX 
B) XXY 
C) XYY 
D) XY 
E) Either A or B would be a possible chromosome complement.

Question 6

Diploid human cells contain 22 homologous chromosomes and a pair of ________.

Accepted Answer

The answer of Diploid human cells contain 22 homologous chromosomes...

Question 7

You mate a squash with the genotype AAbb with a squash with the genotype aaBB.The resulting F1 squash are all AaBb.After mating two F1 squash,you obtain an F2 generation of squash as follows: ("-" = either allele)
$$\begin{array} { l r } 
A -\quad B - & 5 \
A - \quad bb & 45 \
a a\quad B - & 47 \
aa \quad bb & 3 \
\hline \text { Total } & 100
\end{array}$$
a)What does this tell you about assortment of the two traits?
b)What could account for the distribution obtained?

Accepted Answer

a)If A and B assorted independently,the

Question 8

________ is the mechanism by which some organisms,such as Komodo dragons,can develop eggs into zygotes without sperm.

Accepted Answer

The answer of ________ is the mechanism by which some...

Question 9

In analyzing data for crosses involving one gene,Mendel discovered that alleles are discrete entities,and that they are separated during formation of gametes.This was the basis of Mendel's law of ________.

Accepted Answer

The answer of In analyzing data for crosses involving one...

Question 10

Alternative forms of a gene are known as

Accepted Answer

A) alleles. 
B) genes. 
C) loci. 
D) spores. 
E) haplotypes. 
A) alleles. 
B) genes. 
C) loci. 
D) spores. 
E) haplotypes.

Question 11

You are investigating two temperature-sensitive mutant cells.In one,you can inactivate shugoshin activity by raising the temperature slightly at the start of meiosis.In the other,you can similarly inactivate separase activity by raising the temperature.How would the two cells be affected by inactivating these proteins?

Accepted Answer

Shugoshin inactivation: Shugoshin preven

Question 12

Homologous chromosomes are held together by

Accepted Answer

A) a synaptonemal complex. 
B) centromeres. 
C) kinetochores. 
D) spindle poles. 
E) bouquets. 
A) a synaptonemal complex. 
B) centromeres. 
C) kinetochores. 
D) spindle poles. 
E) bouquets.

Question 13

A bacterial cell in which the F plasmid is integrated into the chromosome is known as

Accepted Answer

A) an F- cell. 
B) an F+ cell. 
C) an F' cell. 
D) an Hfr cell. 
E) None of the above. 
A) an F- cell. 
B) an F+ cell. 
C) an F' cell. 
D) an Hfr cell. 
E) None of the above.

Question 14

Crossing over between the A and B genes in a parental cell containing an AB chromosome and an ab chromosome yields which of the following ratios of parental:recombinant gametes?

Accepted Answer

A) 100:0 
B) 75:25 
C) 50:50 
D) 25:75 
E) The ratio depends on whether the parental cell is male or female. 
A) 100:0 
B) 75:25 
C) 50:50 
D) 25:75 
E) The ratio depends on whether the parental cell is male or female.

Question 15

Synapsis between chromosomes in some species is promoted by special DNA sequences known as

Accepted Answer

A) centromeres. 
B) telomeres. 
C) pairing sites. 
D) chiasmata. 
E) bouquets. 
A) centromeres. 
B) telomeres. 
C) pairing sites. 
D) chiasmata. 
E) bouquets.

Question 16

Most cases of Down syndrome are caused by three copies of chromosome number ________.

Accepted Answer

The answer of Most cases of Down syndrome are caused...

Question 17

Each of the following is associated with F factor transfer from an F+ bacterium to an F− bacterium except

Accepted Answer

A) transfer involves conjugation. 
B) transfer of the plasmid begins at the plasmid origin of transfer. 
C) transfer of the plasmid converts the original F+ cell to an F− cell. 
D) following transfer,the F factor can become integrated into the F− cell genome to generate an Hfr cell. 
E) All the above are associated with the F factor transfer. 
A) transfer involves conjugation. 
B) transfer of the plasmid begins at the plasmid origin of transfer. 
C) transfer of the plasmid converts the original F+ cell to an F− cell. 
D) following transfer,the F factor can become integrated into the F− cell genome to generate an Hfr cell. 
E) All the above are associated with the F factor transfer.

Question 18

In an individual pea plant,the visible characteristics of yellow and wrinkled seeds are the plant's ________.

Accepted Answer

The answer of In an individual pea plant,the visible characteristics...

Question 19

A structure consisting of two homologous chromosomes bound together so tightly during the first meiotic prophase that they behave as a single unit is called a ________.

Accepted Answer

The answer of A structure consisting of two homologous chromosomes...

Question 20

In a cross of two individuals,both of whom have genotype AaBb,what proportion of the offspring are expected to have the genotype AABB?

Accepted Answer

A) 9/16 
B) 1/16 
C) 1/2 
D) 3/16 
E) 6/16 
A) 9/16 
B) 1/16 
C) 1/2 
D) 3/16 
E) 6/16

Exam 25: Sexual Reproduction,meiosis,and Genetic Recombination

The synaptonemal complex becomes fully developed during which stage of prophase I?

Which of the following applies to organisms,particularly plants and fungi,that have distinct haploid and diploid phases of their life cycles?

A black Labrador retriever named JD is heterozygous (Bb)for coat color (B = black and b = brown).Bb is JD's

________ is the term used to describe the condition of a cell containing a chromosome number that is not a multiple of the haploid number.

Diploid human cells contain 22 homologous chromosomes and a pair of ________.

________ is the mechanism by which some organisms,such as Komodo dragons,can develop eggs into zygotes without sperm.

In analyzing data for crosses involving one gene,Mendel discovered that alleles are discrete entities,and that they are separated during formation of gametes.This was the basis of Mendel's law of ________.

Alternative forms of a gene are known as

Homologous chromosomes are held together by

A bacterial cell in which the F plasmid is integrated into the chromosome is known as

Crossing over between the A and B genes in a parental cell containing an AB chromosome and an ab chromosome yields which of the following ratios of parental:recombinant gametes?

Synapsis between chromosomes in some species is promoted by special DNA sequences known as

Most cases of Down syndrome are caused by three copies of chromosome number ________.

Each of the following is associated with F factor transfer from an F+ bacterium to an F− bacterium except

In an individual pea plant,the visible characteristics of yellow and wrinkled seeds are the plant's ________.

A structure consisting of two homologous chromosomes bound together so tightly during the first meiotic prophase that they behave as a single unit is called a ________.

In a cross of two individuals,both of whom have genotype AaBb,what proportion of the offspring are expected to have the genotype AABB?

A Preview of Cell Biology

The Chemistry of the Cell

The Macromolecules of the Cell

Cells and Organelles

Bioenergetics: the Flow of Energy in the Cell

Enzymes: the Catalysts of Life

Membranes: Their Structure,function,and Chemistry

Transport Across Membranes: Overcoming the Permeability Barrier

Chemotrophic Energy Metabolism: Glycolysis and Fermentation

Chemotrophic Energy Metabolism: Aerobic Respiration

Phototrophic Energy Metabolism: Photosynthesis

The Endomembrane System

Cytoskeletal Systems

Cellular Movement: Motility and Contractility

Beyond the Cell: Cell Adhesions, cell Junctions, and Extracellular Structures

The Structural Basis of Cellular Information: Dna, chromosomes, and the Nucleus

DNA Replication, repair, and Recombination

Gene Expression: Ithe Genetic Code and Transcription

Gene Expression: Iiprotein Synthesis and Sorting

The Regulation of Gene Expression

Molecular Biology Techniques for Cell Biology

Signal Transduction Mechanisms: Ielectrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Iimessengers and Receptors

The Cell Cycle and Mitosis

Filters

Each of the following is associated with F factor transfer from an F⁺ bacterium to an F⁻ bacterium except

In a cross of two individuals,both of whom have genotype AaBb,what proportion of the offspringare expected to havethe genotypeAABB?