from practice quizzes

Question 1

lines that produce offspring carrying specific parental traits that remain constant from generation to generation

Answer 1

true-breeding

Question 2

is a gamete a sperm or an egg or a zygote

Answer 2

its either a sperm or an egg

Question 3

most single-gene diseases that are not of late-onset are caused by ____

Answer 3

recessive allele

Question 4

Most single-gene diseases in humans that are not of late-onset are caused by which of the following?

Vertical pattern of inheritance
Reciprocal allele
Horizontal pattern of inheritance
Recessive alleles
Dominant alleles

Answer 4

Recessive alleles

Question 5

Cells in the G2 stage of the cell cycle have ________ as cells of the same species in the G1 stage.

twice as many chromosomes
half as many chromatids
twice as many chromatids
half as many chromosomes
the same number of chromatids

Answer 5

twice as many chromatids

Question 6

A cell with three pairs of chromosomes has the genotype A/a;B/b;C/c, such that each pair of alleles is on a different pair of chromosomes. If this cell were to undergo mitotic division, how many genetically different types of cells could be produced?

1
3
6
8
9

Answer 6

1

Question 7

The nuclear envelope breaks down during which of the following mitotic phases?

Correct Answer
Prometaphase
Cytokinesis
Anaphase
Prophase
Telophase

Answer 7

Prometaphase

Question 8

Nucleoli begin to disappear during which of the following mitotic phases?

Metaphase
Telophase
Prophase
Cytokinesis
Anaphase

Answer 8

Prophase

Question 9

Cells said to be in the G0 stage

are in an extended G1 phase and no longer cycling.
are replicating their chromosomes.
have two chromatids per chromosome.
are about to enter the mitotic phase of the cell cycle.
are dead.

Answer 9

are in an extended G1 phase and no longer cycling.

Question 10

The zipper-like connection between paired homologs in early prophase is known as a
chiasma.

spindle fibre.
synaptic junction.
synaptonemal complex.
None of the choices are correct.

Answer 10

synaptonemal complex

Question 11

In terms of evolution, what is the most frequent outcome of repeated duplications of different segments of a species’ genome?

aneuploidy
speciation
gene families
cancer
semisterility

Answer 11

gene families

Question 12

Which of the following does not happen when an intragenic inversion occurs?

The gene’s function remains unaffected.
One part of the gene is relocated to another chromosome.
One part of the gene is relocated to a distant region of the chromosome.
The length of the chromosome remains unaffected.
One part of the gene stays at its original site.

Answer 12

The gene’s function remains unaffected.

Question 14

what is genetic redundancy

Answer 14

when single genes work together and require one dominant allele from either loci to create multiple phenotypes

Question 15

what occurs when chromosomes fail to separate during meiosis

Answer 15

nondisjunction

Question 16

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

Answer 16

centrosome

Question 17

the process of matching chromosomes becoming zipped together during the zygotene stage of prophase I is called________

Answer 17

synapsis