Font size
WorksheetsGenetics Test Two Review
Total questions: 18
Worksheet time: 19mins
Which explanation is TRUE regarding the stuctures of DNA and RNA, and how do they relate to replication and the expression of a gene?
Replication involves copying a whole molecule to produce a double-stranded molecule of DNA.
RNA is single-stranded and is transcribed from a portion of one strand of DNA to produce a protein.
Replication involves copying a whole molecule to produce a double-stranded molecule of RNA. DNA is single-stranded and is transcribed from a portion of one strand of RNA to produce a protein.
Replication involves copying a whole molecule to produce a double-stranded molecule of RNA.
DNA is single-stranded and is transcribed from a portion of one strand of RNA to produce a protein
Replication involves copying a whole molecule to produce a double-stranded molecule of DNA. RNA is single-stranded and is transcribed from a portion of one strand of a protein to produce DNA.
This diagram shows a pedigree for a recessive genetic disorder. What is the genotype for individual 6? Is this a sex-linked or autosomal disorder? (A = dominant, a = recessive)
In the F2 Generation in Mendel’s experiments, the ratio of dominant to recessive phenotypes was
2:2
3:1
4:0
1:3
A woman with Type AB blood marries a man with Type B blood. According to the Punnett square, their children would have each of these blood types except:
Type A
Type B
Type AB
Type O
In tomato plants, the allele for red fruit color (R) is dominant to the allele for yellow fruit color (r). The allele for round-shaped fruit (F) is dominant to the allele for pear-shaped (f).
Two tomato plants, heteozygous for fruit color and fruit shape, are crossed. The Punnett square for this dihybrid cross is shown below.
a. For this cross, identify all the possible phenotypes of the offspring.
b. Determine the ratio of red round-shaped fruit predicted by the cross.
c. Explain what is meant by independent assortment and describe one way in which your answers to the previous parts support the conclusion that the genes for fruit color and fruit shape sort independently.
Sickle cell anemia is a disease that occurs when an individual receives a recessive allele for sickle cell from each parent. Assume that a woman who is a carrier for sickle cell marries a man who is free of the disease. What are the chances of this couple having a child with sickle cell anemia?
0%
25%
50%
100%
An advantage to Mendel working with purebred plants is:
purebred individuals are homozygous so there are no hidden alleles
purebred plants were more readily available.
purebred plants were easier to grow in larger quantities.
only purebred plants could be self-pollinated.
This cell is in the process of mitosis. What is the phase of mitosis?
telephase
cytokinesis
anaphase
metaphase
What method uses an electric current to separate DNA fragments by size?
DNA splicing
Gel Electrophoresis
Recombinant DNA
Polymerase Chain Reaction
Which suspect's DNA matches the felon's DNA left at the crime scene?
Suspect 1
Suspect 2
Suspect 3
None of the suspects were at the crime scene
Which of the following mutations results from one nucleotide being substituted for another?
Point
Insertion
Deletion
Frameshift
The allele for tall pea plants is dominant over the allele for short pea plants. In a cross between a homozygous tall plant and a short pea plant, what are the possible phenotypes of the offspring?
100% tall
100% short
50% tall and 50% short
75% tall and 25% short
The table lists the hair color and genotype of six individuals where black hair is dominant over blond. Use the table to answer any questions that follow.
If Mr. and Mrs. Johnson had four children together, what color of hair would the children likely have?
all 4 would have black hair
only 3 of the children would have black hair, 1 child would have blond hair
all 4 of the children would have blond hair
only 2 of the children would have black hair and 2 of the children would have blond hair.
The table lists the hair color and genotype of six individuals where black hair is dominant over blond. Use the table to answer any questions that follow.
If Mr. and Mrs. Ellwood had four children together, which of the following would likely represent the children's genotypes?
Only 2 of the children would be heterozygous Bb and 2 of the children would be homozygous bb.
All 4 of the children would be heterozygous Bb.
Only 3 of the children would be heterozygous Bb and 1 child would be homozygous bb.
All 4 of the children would homozygous bb.
In a population of dogs, the allele for curly hair is dominant over the allele for straight hair. If two parents are heterozygous for this trait, what percentage of their offspring are expected to have straight hair?
(a)
Which of the following is a benefit of sexual reproduction when compared to asexual reproduction?
It introduces genetic variation, which increases the survival rate of a species when environmental changes occur.
It is a more reliable form of reproduction, as it requires the search for a mate that is the best match to form offspring.
It requires internal fertilization, which is easier and requires less energy that asexual reproduction.
It has a slower reproductive rate, decreasing the amount of mutations that occur in the offspring.
Which of the following statements best describes a benefit of sexual reproduction?
It creates many offspring in a short amount of time.
It prevents mutations from being passed on to offspring.
It results in diversity of the species that enhances the probability of survival.
It ensures the offspring will receive only the best traits from each of the parents.
E = free earlobes
e = attached earlobes
Which of the following does EE represent?
homozygous recessive
homozygous dominant
heterozygous
sex-linked
