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Genetics + Meiosis Review for Exam

Total questions: 48

Worksheet time: 12hrs 0mins

Name
Class
Date
1.

A human baby boy inherits a recessive allele from his mother. In which circumstance would he most likely show the trait coded for by the recessive allele?

a)

The baby inherits the dominant allele from his father.

b)

The allele is on an autosomal chromosome and the baby is a twin.

c)

The allele is on the X chromosome.

d)

The allele is on the Y chromosome.

2.

Why are males more likely to exhibit sex-linked disorders than females?

a)

Males have two X chromosomes that amplify all sex-linked disorders

b)

Males have one X chromosome on which most sex-linked disorders are located.

c)

Males have only one functional sex chromosome on which all gender traits are located.

d)

Males have multiple sex chromosomes that mutate causing sex-linked disorders to become visible.

3.
The visual representation of an individual's chromosomes is a 
a)
phenotype
b)
genotype
c)
karyotype
d)
stereotype
4.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY
5.
In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?
a)
100%
b)
75%
c)
50%
d)
25%
6.
This is an example of ___________?
a)
Incomplete dominance
b)
Co-Dominance
7.
This is an example of ___________.
a)
 Incomplete Dominance
b)
 Codominance
8.
A trait that can be hidden.
a)
recessive
b)
dominant
trait
c)
dominant
9.
The Himalayan Chinchilla can be different varieties of colors based on inheriting combinations of the  C allele, Cch , or Ch allele
a)
Polygenic Inheritance
b)
Pleiotropy
c)
Codominance 
d)
Multiple Alleles
10.
If this pedigree shows an autosomal recessive disorder, what MUST the genotype of individual II-3 be?
a)
HH
b)
Hh
c)
hh
d)
None of the above
11.

Alleles for the A and B blood cell antigens are codominant. The condition where no antigens are present on the blood cells (type O blood) is a recessive trait. Which set of parents can most likely produce a child with type O blood?

a)

one parent with type AB blood, and the other parent with type A blood

b)

one parent with type AB blood and the other parent with type O blood

c)

one parent with heterozygous type A blood, and the other parent with type O blood

d)

one parent with homozygous type A blood, and the other parent with homozygous type B blood

12.

Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who does not have hemophilia and a woman whose father is a hemophiliac?

a)

Each of their sons will have hemophilia.

b)

None of their daughters will have hemophilia.

c)

Their sons have a 25% chance of having hemophilia.

d)

There is a 50% chance that their daughters will have hemophilia

13.

One of the parents of a child has phenylketonuria (PKU), which is caused by recessive alleles. The other parent does not have the PKU alleles. What is the chance that the couple will have a child with phenylketonuria?

a)

0%

b)

50%

c)

75%

d)

100%

14.

Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb marries a man who is heterozygous for hitchhiker's thumb. What is the probable genotypic ratio of their children?

a)

0% Hh: 100% hh

b)

50% Hh: 50% hh

c)

75% Hh: 25% hh

d)

100% Hh: 0% hh

15.

a trait that is masked unless 2 copies are present is ________________________

a)

recessive

b)

dominant

c)

weak

d)

hidden

16.
What type of inheritance do two alleles have if their traits blend together? 
a)
Incomplete Dominance
b)
Co-Dominance
17.

Which of the following are genotypes for blood type B?

a)

IA IA and IA IB

b)

IB IB and ii

c)

IB IB and IB i

d)

IA IB and IA IB

18.
You get your genes from:
a)
Department Store
b)
Parents
c)
Aunt
d)
Neighbor
19.
T4 - What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
20.

In Drosophila (fruit flies) the sex-linked trait of red eye color (XR) is dominant over white (Xr). Which is the correct genotype for a red-eyed male fruit fly?

a)

XRXr

b)

XrX

c)

XrY

d)

XRY

21.
An organism's phenotype describes its __________.
a)
genetic makeup
b)
physical appearance
22.
How many chromosomes are found in human egg and sperm cells?
a)
20
b)
23
c)
26
d)
46
23.
A recessive trait only shows up when __________.
a)
two dominant alleles are present
b)
one dominant allele is present
c)
two recessive alleles are present
d)
at least one dominant allele is present
24.
A dominant trait shows up __________.
a)
only when two dominant alleles are present
b)
only when one dominant allele is present
c)
when at least one recessive allele is present
d)
when at least one dominant allele is present
25.

Why are men 16 times more likely to be color-blind than women?

a)

to be color-blind, you must have a Y chromosome

b)

to be color-blind, the recessive trait must be present on both (female) or one (male) of the X chromosomes

c)

color-blindness is caused by testosterone

d)

color-blindness is caused by the same gene as baldness

26.

The gender of a child is determined by

a)

whether the father's sperm contains an x or y chromosome

b)

whether the mother's egg contains an x or y chromosome

c)

the age of the parents

27.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XbY
d)
XBY
28.

This diagram shows a diploid cell with two pairs of homologous chromosomes.

a)

SsTt

b)

Ss, Tt

c)

S, s, T, t

d)

St, sT, ST, st

29.

The table lists the trials for fruit color where allele R exhibits incomplete dominance over allele R'. Heterozygous fruit have orange phenotypes. What percent of offspring are expected to have an orange phenotype if the parent plants are orange (RR') and yellow (R'R')?

a)

25%

b)

50%

c)

75%

d)

100%

30.
Meiosis makes sperm and egg cells. In humans, sperm and egg cells each have _____ chromosomes. Therefore a fertilized human egg cell (sperm and egg cell combined) would create a cell with _____ chromosomes.
a)
23, 46
b)
46, 23
c)
2, 4
d)
50, 100
31.
What kind of cells are made in MEIOSIS?
a)
Haploid Gametes
b)
Diploid Somatic Cells
c)
Skin Cells
d)
Liver Cells
32.
The process of crossing over occurs in what phase of meiosis?
a)
anaphase 1
b)
prophase 1
c)
prophase 2
d)
telophase 1
33.
Crossing over helps promote 
a)
male genotype
b)
genetic variation
c)
DNA replication
d)
mitosis
34.

There are a total of _______ chromosomes in human sperm or egg cells.

a)

2

b)

23

c)

46

d)

92

35.

The diagram represents a change in composition of homologous chromosomes. This change is most likely the result of the process called-

a)

Heterozygous

b)

Crossing over

c)

Mutation

d)

Mitosis

36.

To be a male of a sexually reproductive species is determined by the presence or absence of which chromosome?

a)

X

b)

Y

c)

Gametic

d)

Autosomal

37.

The chromosomes that pair up during Prophase I of meiosis, are called __________ chromosomes.

a)

homozygous

b)

deuterostomal

c)

homologous

d)

fertilial

38.

Which process produces diploid cells?

a)

Mitosis

b)

Meiosis

39.

Which process produces cells that are unique / different from each other?

a)

Mitosis

b)

Meiosis

40.

Which process produces cells that are identical?

a)

Mitosis

b)

Meiosis

41.

Which process produces 2 cells?

a)

Mitosis

b)

Meiosis

42.

Which process produces 4 cells?

a)

Mitosis

b)

Meiosis

43.

During which process does the cell divide two times?

a)

Mitosis

b)

Meiosis

44.

During which process does the cell divide only once?

a)

Mitosis

b)

Meiosis

45.

Which is a type of sexual reproduction?

a)

Mitosis

b)

Meiosis

46.

Which is a type of asexual reproduction?

a)

Mitosis

b)

Meiosis

47.

Which of the following describes meiosis?

a)

Cell division--creates new somatic cells

b)

Cell division--creates gametes

48.

Which of the following describes mitosis?

a)

Cell division--creates new somatic cells

b)

Cell division--creates gametes

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