WorksheetsGenetics Quiz
Total questions: 25
Worksheet time: 50mins
In guinea pigs, the allele for black fur (B) is dominant. The allele for brown fur is recessive. Two guinea pigs were crossed as shown in the Punnett square. Which describes the phenotypes of the parent guinea pigs?
Both parents have black fur
Both parents have brown fur
One parent has black fur and the other has brown fur
One parent has black fur and the other has black and brown spotted fur
Which of the following can be concluded about the genes for each parent?
Both parents are heterozygous
Both parents are homozygous recessive
Both parents are homozygous dominant
One parent is heterozygous and one his homozygous
A capital letter indicates a/an __allele.
dominant
recessive
mutant
superior
T/F: A recessive allele is expressed if there is no dominant allele.
true
false
The two alleles in a genotype are the same.
dominant
recessive
homozygous
heterozygous
The __refers to the allele combination for particular genes while the __ is the expression of that allele combination.
phenotype--karyotype
phenotype--genotype
genotype--phenotype
genotype--karyotype
In humans, B is the allele for brown eyes and b is the allele for blue eyes. Two brothers both have brown eyes, but one of them has both the B and b alleles while the other only has B alleles. Which statement is true about the brothers?
they have the same genotype and phenotype
they have different phenotypes and genotypes
they have the same phenotype but different genotypes
they have the same genotype but different phenotypes
In horses, the gene for white hair (W) is dominant to the gene for non-white hair (w). A horse with genotype WW was crossed with a horse with a genotype of ww, as shown in the Punnett square. What percent of the offspring should be expected to have white hair?
0 %
50 %
75 %
100 %
The table below shows the genotypes that result in four different blood types in humans. Based on the information in the table, which of the following describes alleles IA and IB? (sorry I cannot do superscripts)
the IA and IB alleles show sex linkage
the IA allele is recessive to the IB allele
the IA allele is dominant to the IB allele
the IA and IB alleles show codominance
Traits controlled by genes on the X chromosome are said to be
sex-linked
incompletely dominant
homozygous
mutagenic
Which of the following is an example of codominance in genetic traits?
a tall pea plant and a short pea plant produce tall pea plants
an orange cat and a black cat produce an orange and black kitten
a blue-eyed man and a brown-eyed woman produce a blue eyed child
a color-blind woman and a man with normal vision produce a color blind son
What does heterozygous mean?
An organism has the same alleles for a trait
An organism has different alleles for a trait
When neither allele if fully dominant, offspring is a mixture of both
the different forms of a trait (hair color - brown, blonde, red)
If red snapdragon (RR) and a pink snapdragon (RW) were crossed, what percentage of the offspring would be white?
0%
25%
50%
75%
What term describes an organism that displays two dominant phenotypes at the same time?
complete dominance
incomplete dominance
codominance
multiple alleles
Red/green colorblindness is a SEX-LINKED recessive trait. A woman who is a carrier for this allele marries a normal vision male. What is the probability that they will have a CHILD who is colorblind?
25%
50%
75%
100%
A father is homozygous A blood while the mother is heterozygous B blood. What are the chances of the couple having offspring with AB blood?
0%
25%
50%
100%
Colorblindness is a sex linked recessive trait. A punnett square is completed for you. What percentage of the female offspring will be a carrier for this recessive disease?
0%
25%
50%
100%
Hemophilia is a recessive x-linked disorder. A male who has hemophilia has a child with a woman who is homozygous dominant for the trait. What percentage of offspring will have the disorder?
0%
25%
50%
100%
Jackie is heterozygous. If B is for brown hair, and b is for blonde hair, what is Jackie's phenotype?
Brown hair
Brown and blonde hair
Blonde hair
Black hair
What is the difference between codominance and incomplete dominance?
They are essentially the same
Codominance always show up, incomplete dominance sometimes show up
Codominance shows traits of both genes, incomplete dominance shows a mix
Codominance need two genes, incomplete dominance only needs one
In a particular plant, dark green leaves are a dominant trait. Plants with light green leaves have the recessive alleles. Which of the boxes marked 1-4 correspond to plants with dark leaves?
1 only
2 and 3
1, 2 and 3
4 only
Which of the following is an example of a homozygous genotype?
Rr
NN
Nr
RN
A red rose was crossed with a white rose and produced the pink rose seen in the picture. What type of inheritance is described?
complete dominance
codominance
incomplete dominance
multiple alleles
In chickens, feather color is codominant. If a black chicken (BB) is mated with a speckled--black and white--(BW), what are the chances of having a chicken that is black?
0%
25%
50%
100%
In Andalusian fowls, black individuals (BB) and white individuals (WW) are homozygous. Heterozygous individuals are gray (BW). Cross a black fowl white fowl and determine the phenotype ratio.
4 black : 0 gray : 0 white
0 black : 4 gray : 0 white
4 BB : 0 BW: 0 WW
0 BB : 4 BW: 0 WW
