Reference no: EM131552753

Biology Assignment

Question 1

A karyotype ______.

compares one set of chromosomes to another.
of a normal human cell shows 48 chromosomes.
is a photograph of cells undergoing mitosis during anaphase.
cannot be used to identify individual chromosomes beyond the fact that two chromosomes are homologues.
is a visual display of chromosomes arranged according to size.

Question 2

At which stage of mitosis are distinct chromatids visible and moving towards the opposite poles of the cell?

Metaphase
Telophase
Interphase
Anaphase
Prophase

Question 3

Mitosis in humans usually results in the formation of _____.

2 diploid cells
4 diploid cells
2 haploid cells
4 haploid cells
Sperm or egg cells

Question 4

All of the following are characteristics of cancer cells EXCEPT _____.

angiogenesis
unregulated mitosis
unmutated DNA
ability to metastasize
no apoptosis

Question 5

What stage does cytokinesis generally overlap with in the typical cell cycle?

S phase
prophase
telophase
anaphase
metaphase

Question 6

An important result of meiosis is that _____.

each gamete receives one member of each pair of homologous chromosomes and gametes are formed that are haploid.
each gamete receives one member of each pair of homologous chromosomes.
gametes are formed that are diploid.
gametes receive one copy of each member of each pair of homologous chromosomes.
gametes are formed that are haploid.

Question 7

What stage does cytokinesis generally overlap with in the typical cell cycle?

S phase
prophase
telophase
anaphase
metaphase

Question 8

An important result of meiosis is that _____.

each gamete receives one member of each pair of homologous chromosomes and gametes are formed that are haploid.
each gamete receives one member of each pair of homologous chromosomes.
gametes are formed that are diploid.
gametes receive one copy of each member of each pair of homologous chromosomes.
gametes are formed that are haploid.

Question 9

All of the genes located on a given chromosome constitute a

linkage group.
karyotype.
none of these
wild-type allele.
bridging cross.

Question 10

For anaphase to begin, which of the following must occur?

Chromatids must lose their kinetochores.
Cohesin must attach the sister chromatids to each other.
Cohesin must be cleaved enzymatically.
Kinetochores must attach to the metaphase plate.
Spindle microtubules must begin to depolymerize.

Question 11

Spindle microtubules attach to kinetochores during this phase of mitosis.

metaphase
prometaphase
anaphase
prohase
telophase

Question 12

Four of the five answers listed below are related by a common phase of mitosis. Select the exception.

chromosomes separate
chromosomes decondense
spindle microtubules disappear
nuclear envelope re-forms
nucleolus reappears

Question 13

A woman is found to have 47 chromosomes, including three X chromosomes. Which of the following describes her expected phenotype?

A) masculine characteristics such as facial hair
B) enlarged genital structures
C) excessive emotional instability
D) normal female
E) sterile female

Question 14

Which of the following is an example of polygenic inheritance?

A) pink flowers in snapdragons
B) the ABO blood group in humans
C) Huntington's disease in humans
D) white and purple flower color in peas
E) skin pigmentation in humans

Question 15

Why did the F1 offspring of Mendel's classic pea cross always look like one of the two parental varieties?

A) No genes interacted to produce the parental phenotype.
B) Each allele affected phenotypic expression.
C) The traits blended together during fertilization.
D) One phenotype was completely dominant over another.
E) Different genes interacted to produce the parental phenotype.

Question 16

Use the following information to answer the questions below.
Tallness (T) in snapdragons is dominant to dwarfness (t), while red (R) flower color is dominant to white (r). The heterozygous condition results in pink (Rr) flower color.
A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F1 individuals?

A) ttRr-dwarf and pink
B) ttrr-dwarf and white
C) TtRr-tall and red
D) TtRr-tall and pink
E) TTRR-tall and red

Question 17

National Basketball Association (NBA) scientists have identified the gene for superior athletic ability. The allele "A" represents the dominant form of the gene, while the allele "a" represents the recessive form of the gene. The scientists find that the superior athletic ability gene is optimally expressed in individuals who possess the homozygous dominant form.
If Michael Jordan, who has the Aa genotype, has a child with a woman who has the aa genotype, what are the chances that his child will inherit the optimal superior athletic ability genotype?

0%
25%
50%
75%
100%

Question 18

There is evidence that a certain color in cats is sex-linked. Yellow is recessive to black.

A heterozygous condition results in tortoise shell or calico color. A calico cat has a litter of 8 kittens: 1 yellow male, 2 black males, 2 yellow females, and 3 calico females. What was the male parents probable color?

yellow
black
calico
yellow and black
albino

Question 19

Imagine you are performing a cross involving seed color in garden plants. What F1 offspring would you expect if you cross true-breeding parents with green seeds with true-breeding parents with yellow seeds?

25% white seeds, 25% yellow seeds, and 50% green seeds
25% green seeds, and 75% yellow seeds
50% yellow seeds, and 50% green seeds
100% yellow seeds
100% yellow-green seeds.