WorksheetsBio. 3.2.2 Genetics
Total questions: 45
Worksheet time: 45mins
Fur color in a specific animal is controlled by a sex-linked, codominant trait, where some animals have black fur (B), some animals have orange fur (R), and some animals have brown-patterned fur (BR). A female with brown-patterned fur mates with a male that has black fur and has a female offspring. What is the probability that the female offspring will have brown-patterned fur?
0%
25%
50%
100%
Black hair color is dominant to white hair color in mice. Interpret the Punnett squrare below to determine the expected phenotypic ratio for the offpring of a homozygous black mouse and a white mouse.
4 Black: 0 White
3 Black: 1 White
2 Black: 2 White
0 Black: 4 White
Black fur (B) is dominant to white fur (b) in guinea pigs. An F1 cross was conducted and resulted in 100% heterozygous guinea pigs (Bb). What is the genotypic ratio outcome of the F2 generation?
4 Bb B.
Bb : 1 bb
1 BB : 2 Bb : 1 bb
2 BB : 1 Bb : 1 bb
Color blindness is inherited as a sex-linked recessive disease. An affected male marries a female who is heterozygous for the trait. What percentage of their offspring will exhibit color blindness?
0%
25%
50%
100%
A father without hemophilia has two daughters and two sons. Neither daughter has hemophilia. One son has hemophilia and the other does not. What is the genotype of the mother?
XH XH
XH Xh
XHY
Xh Y
9. Having freckles is dominant over not having freckles. If two individuals heterozygous for freckles have a child, what is the probability the child will have freckles?
0%
25%
50%
75%
The ABO blood group has three different alleles: IA , IB , and i. The genotypes and phenotypes (blood types) for different combinations of the three alleles are shown in the table.
What percentage of offspring from a cross between a homozygous Type A parent with a heterozygous Type A parent is expected to contain the i allele?
25%
50%
75%
100%
Tay-Sachs disease is a lethal, autosomal recessive genetic disorder. If both parents are heterozygous carriers of the disease, what are the chances of them having a child who is also a heterozygous carrier for Tay-Sachs?
25%
50%
75%
100%
Which of the following is an example of sex-linked inheritance?
diabetes
cystic fibrosis
hemophilia
albinism
Gregor Mendel cross-pollinated red and white snapdragon flowers. What information indicates that incomplete dominance was achieved?
The offspring had heterozygous alleles.
The offspring had a recessive allele.
The offspring were pink
The offspring were red.
A male fruit fly is homozygous dominant for gray-body color (G) and is crossed with a female fruit fly that is homozygous recessive for ebony-body color (g). What are the probable phenotypes of the offspring?
25% gray, 75% ebony
50% gray, 50% ebony
100% ebony
100% gray
Scott was looking at the results of a cross between red and white flowers. Which is the MOST likely result of a cross that demonstrates incomplete dominance?
0% pink flowers
25% white flowers
50% red flowers
100% pink flowers
What is the chance of two parents with blood types AB and O producing an offspring with blood type O?
0%
25%
50%
100%
A man has a recessive genetic condition that neither of his parents expressed. His wife does not have this condition. However, she is a carrier. Based on this information, which Punnett square correctly predicts the probability that their children will have this genetic condition?
When a man has an allele combination Ww for a trait, what percentage of his gametes will have a dominant allele for that trait?
25%
50%
75%
100%
7. Shaded individuals in this pedigree express a particular trait. Based on this pedigree, what is the mode of inheritance of the trait?
autosomal dominant
autosomal recessive
sex-linked dominant
sex-linked recessive
Shaded individuals in this pedigree express a particular trait. Based on this pedigree, what is the mode of inheritance of the trait?
autosomal dominant
autosomal recessive
sex-linked dominant
sex-linked recessive
Shaded individuals in this pedigree express a particular trait. Based on this pedigree, what is the mode of inheritance of the trait?
sex-linked dominant
sex-linked recessive
autosomal dominant
autosomal recessive
What would be the phenotype of a cross between a homozygous dominant tall plant and a homozygous recessive short plant?
100% tall
100% short
25% short, 75% tall
50% short, 50% tall
Eye color in human beings is an
instinct
acquired trait
inherited trait
environmentally influenced trait
The color in a Tortoiseshell cat can only be produced by two X chromosomes. This would mean that these types of cats are always
male
female
fertile
aggressive
A black coat color in Labrador retriever dogs is dominant over a yellow coat color. A blackcoated male that is heterozygous for the trait is crossed with a yellow-coated female. What is the MOST likely result of the cross?
All of the puppies will have black coats.
All of the puppies will have yellow coats
Some of the puppies will have black coats with yellow spots.
Some of the puppies will have black coats, and some will have yellow coats.
A student’s mother is heterozygous for attached earlobes, a recessive trait. The student’s father is also heterozygous for that trait. What is the percent likelihood that this student has attached earlobes?
0%
25%
50%
75%
A plant that grows red flowers was crossed with the same kind of plant that grows white flowers. Their offspring grew pink flowers. Which BEST explains why the offspring grew pink flowers?
The offspring experienced a genetic mutation
The offspring resulted from asexual reproduction.
The genes for flower color exhibited incomplete dominance
A gene for pink-colored flowers was recessive in one of the parents.
Which of these is NOT an inherited trait in humans?
height
hair color
skin color
intelligence
In certain species of plants, purple flowers (P) are dominant to white flowers (p). If two heterozygous plants are crossed, what will be the phenotype of the offspring?
100% purple flowers
100% white flowers
75% white flowers, 25% purple flowers
25% white flowers, 75% purple flowers
A student is predicting whether the seeds of pea plants produced by the cross shown in the Punnett square will be wrinkled or round. Round (R) seeds are dominant, and wrinkled (r) seeds are recessive. This cross will produce what percentage of offspring?
100% round, 0% wrinkled
75% round, 25% wrinkled
50% round, 50% wrinkled
. 25% round, 75% wrinkled
. When a red bull (RR) is bred with a white cow (WW), a roan calf (RW) is sometimes produced. If a roan bull (RW) is bred with a roan cow (RW), what is the MOST likely outcome of the offspring?
1 red, 1 white, and 2 roan
0 red, 1 white, and 3 roan
2 red, 2 white, and 0 roan
0 red, 0 white, and 4 roan
A mother is heterozygous for blood type A and a father has blood type AB. What is the probability that their offspring would have type A blood?
0%
25%
50%
75%
A man with type O blood has children with a woman who is heterozygous for type A blood. What is the probability that their children will have type A blood?
0%
25%
50%
75%
Which cross could produce a child with type O (ii) blood?
IA i x ii
IA IA x ii
IB IB x AI i
IB IB x ii
What are the possible phenotypes for the children of a mother with Type O blood and a father with Type AB blood?
AB blood or O blood
A blood or B blood
A blood or O blood
B blood or O blood
If two people with Type AB blood have a child, what possible blood type could their child have?
Type A, Type B, or Type O
Type A, Type B, or Type AB
Type A or Type B
Type AB only
Hemophilia is a sex–linked recessive trait. If a man with hemophilia marries a woman who is a carrier for the trait, what are the predicted phenotypes for their children?
1 carrier male: 1 affected male: 1 carrier female: 1 affected female
1 carrier male: 1 affected male: 1 carrier female: 1 normal female
1 normal male: 1 affected male: 1 carrier female: 1 affected female
1 normal male: 1 affected male: 1 carrier female: 1 normal female
. What is the probability of a man with Type AB blood and a woman with Type O blood having an offspring with Type O blood?
100 %
50 %
25 %
0%
Red-green color blindness is an X-linked recessive trait. A red-green color-blind woman and a red-green color-blind man have a son. What is the probability that the son is also red-green color-blind?
100 %
50 %
25 %
0 %
A woman is a carrier for color blindness, a sex–linked trait. If she marries a man who is not color–blind, what is the probability that one of their sons will inherit the trait?
0%
25 %
50 %
100 %
What information can be revealed by a Punnett square?
pattern of inheritance in families
genotype and phenotype of an individual offspring
potential genotypes and phenotypes of offspring
potential chromosomal abnormalities in offspring
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?
0%
50 %
75 %
100 %
In humans, free earlobes are dominant to attached earlobes. If a homozygous dominant male has children with a homozygous recessive female, what percent of their children can be expected to have free earlobes?
0 %
25%
50 %
100 %
A tall pea plant (TT) is crossed with a short pea plant (tt). What is the probability that the offspring will be tall?
25%
50%
75%
100%
The diagram below shows independently assorted chromosomes from meiosis.
two possible allele combinations in gametes: Aa or Bb
two possible allele combinations in gametes: AB or ab
four possible allele combinations in gametes: Aa, Aa, Bb, or bb
four possible allele combinations in gametes: AB, Ab, aB, or ab
Two different genes coding for different traits are found on two different chromosomes. How does meiosis explain the variety of genotypes in potential offspring
During meiosis, both chromosomes pass on two alleles to each of two diploid cells.
During meiosis, both chromosomes pass on one allele to each of two diploid cells.
During meiosis, both chromosomes pass on two alleles to each of four haploid cells.
During meiosis, both chromosomes pass on one allele to each of four haploid cells.
This Punnett square shows the possible cross between a heterozygous smooth seed pea plant and a homozygous recessive wrinkled seed pea plant. Which best describes the phenotypes of the possible offspring from this cross?
All of the offspring will have wrinkled seeds.
All of the offspring will have smooth seeds.
Three–fourths of the offspring will have smooth seeds and one–fourth will have wrinkled seeds.
One–half of the offspring will have smooth seeds and one–half will have wrinkled seeds.
A Shorthorn cow has a red and white mixed coat called roan. There are either red hairs or white hairs in the coat. What is the genotype for codominant roan color?
R R
R W
W W
r w
