WorksheetsGenetics
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
Which is an advantage to sexual reproduction?
a)
Asexual reproduction requires more energy to conduct
b)
Sexual reproduction is simple and more rapid, allowing more offspring
c)
sexual reproduction reduces stress, because it derives nutrients mutually from two individuals
d)
sexual reproduction produces offspring with new combinations of chromosomes, increasing diversity.
2.
If an animal's somatic cells contain 2n chromosomes, what happens to the number of chromosomes in the animal's gametes?
a)
the number is reduced to n by mitosis
b)
the number is reduced to n by meiosis
c)
the number is increased by 4n by mitosis
d)
the number is increased by 4n by meiosis
3.
Which statement about meiosis is most accurate?
a)
during meiosis, the mother's and father's chromosomes are equally divided between the sex cells
b)
during meiosis, each member of a chromosome pair separates and randomly goes into a different sex cell
c)
during meiosis, all of the chromosomes are copied so that each sex cell has every chromosome found in the parent
d)
during meiosis, all of the mother's chromosomes enter one sex cell while the father's chromosomes enter another sex cell.
4.
Which process describes chromosomes failure to separate?
a)
replication
b)
nondisjunction
c)
mutation
d)
crossingover
5.
An individual has 3 chromosomes at the 21st pair. Which is most likely the cause?
a)
disjunction
b)
crossing over
c)
gene mutation
d)
nondisjunction
6.
Crossing over....
a)
increasing genetic variation
b)
decreases genetic variation
c)
increases the number of chromosomes
d)
decreases the number of chromosomes
7.
Which best describes how meiosis leads to greater genetic diversity through independent assortment?
a)
weak chromosomes are destroyed during meiosis
b)
duplicated chromosomes create an exact copy of each chromosome
c)
Chromosomes split twice, forming four chromosomes that enter a separate gamete
d)
chromosomes are paired dominant-dominant and recessive-recessive during metaphase.
8.
A tall pea plant (TT) is crossed with a short pea plant (tt). What is the probability that the offspring will be tall?
a)
25%
b)
50%
c)
75%
d)
100%
9.
When crossing parents with the genotypes Rr and rr, what will be the percentages of the genotypes of the offspring?
a)
75% Rr, 25% rr
b)
50% Rr, 50% rr
c)
100% Rr
d)
100% rr
10.
Eye color in human beings is an
a)
instinct
b)
acquired trait
c)
inherited trait
d)
environmentally influenced trait
11.
A man who has a genotype, Aa, marries a woman with the genotype, AA. What is the probability that their offspring will have the genotype, Aa?
a)
25%
b)
33%
c)
50%
d)
75%
12.
A woman with attached earlobes and facial freckles marries a man with free earlobes and no facial freckles. They have 6 children, all of whom have free earlobes and facial freckles. Which is the most likely genetic explanation for this?
a)
both traits are genetically linked on the same chromosome
b)
since at least one parent carries one allele for the dominant trait, all the children express the dominant trait
c)
segregation of the alleles is always random; thus, having all children expressing the same traits was a low probability event.
d)
the woman was homozygous for facial freckles and the man was homozygous for free earlobes.
13.
Tay-Sachs disease is a recessive genetic disorder. If only one gene is present, an individual is a carrier. What is the probability of two healthy Tay-Sachs carriers having a child that has the disease?
a)
0%
b)
25%
c)
50%
d)
75%
14.
Which of these is part of the description of protein?
a)
a folded chain of amino acids
b)
a folded chain of carbohydrates
c)
a branched chain of fatty acids
d)
a branched chain of nucleic acids
15.
Which causes many of the similarities in all living things?
a)
energy requirements
b)
cellular organization
c)
cell wall composition
d)
nucleotides bases
16.
Which correctly orders the use of the three main types of RNA during protein synthesis?
a)
mRNA - rRNA - tRNA
b)
tRNA-rRNA-mRNA
c)
mRNA-tRNA-rRNA
d)
tRNA-mRNA-rRNA
17.
Which process produces mRNA?
a)
replication of DNA
b)
translation of DNA
c)
crossing over of DNA
d)
transcription of DNA
18.
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%
19.
Which information can be revealed by a Punnett square?
a)
pattern of inheritance in families
b)
genotype and phenotype of an individual offspring
c)
potential genotypes and phenotypes of offspring
d)
potential chromosomal abnormalities in offspring
20.
Which is a likely outcome of independent assortment?
a)
decreased genetic variation
b)
increased genetic variation
c)
decreased self-fertilization
d)
increased self-fertilization
21.
Which is the primary function of a vacuole?
a)
to digest food and water
b)
to store food and water
c)
to remove wastes
d)
to store proteins
22.
Which best describes a selectively permeable plasma membrane?
a)
only water can pass through the membrane
b)
all substances can pass through the membrane
c)
only certain substances can pass through the membrane
d)
all substances use carrier proteins to pass through the membrane
23.
Which structures contain DNA
a)
vacuoles
b)
nucleus
c)
ribosome
d)
cell membrane
24.
which organelle is responsible for the direction of all cellular functions?
a)
chromosome
b)
mitochondria
c)
nucleolus
d)
nucleus
25.
Who is the father of genetics?
a)
Charles Darwin
b)
Robert Hooke
c)
Gregor Mendel
d)
Rudolf Virchow
100 %
