WorksheetsGenetics II
Total questions: 23
Worksheet time: 12mins
An allele is a / an______________ of a gene
copy
homologous copy
variant
centromere
The genotypes of the parents of this punnet square are
both heterozygous
both homozygous
neither heterozygous
heterozygous and homozygous
Two brown mice are crossed (BBxBb).
What percentage of the offspring will be homozygous?
25%
50%
75%
100%
This picture shows
incomplete dominance
co-dominance
homozygous genotypes
X-linked dominance
Look at the punnet square for blood type.
What percentage of the offspring will be carriers for the recessive "O" gene?
1%
25%
50%
100%
Blood type AB is an example of _________ as the blood cells display both ________ equally.
homozygous, genotype
co-dominance, phenotypes
x-linked dominance, heterozygous
incomplete dominance, phenotypes
What forms the "rungs" of DNA?
base pairs
nucleotides
sugars
phosphates
Select the two correct answers.
The backbone of DNA consists of alternating __________ and __________
thamine
phosphates
base pairs
sugars
nucleotides
What is the number of chromosomes in a somatic cell of a mouse?
19
20
38
40
Based on the karyotype, which of the following would be a reasonable statement about the production of gametes in mice?
At the end of the DNA synthesis during interphase, the mouse cells would have over 100 individual chromosomes.
During metaphase II of meiosis, each cell would have 20 individual chromosomes and 40 chromatids.
By the end of cellular division by mitosis, each gamete would have 20 pairs of homologous chromosomes.
The last step of meiosis II is cytokinesis, which results in four gamete cells each having 40 individual chromosomes.
What is a danger to a population that reproduces asexually?
They can't reproduce fast enough.
They have too much variety in their genes.
Since they have the same immunity, one disease can wipe them all out.
They can become adapted to the environment
Blood type in humans has three alelles: A, B, and O. A and B are both dominant to O. Therefore, there are two ways to have Type A blood:
AA and AO
BB and BO
AB and AA
AB and BB
Blood type in humans has three alelles: A, B, and O.
A and B are both dominant to O.
If a couple who are both Type O marry and have three children, what are their bloodtypes?
Type AB
Type A
Type B
Type O
Trisomy is a condition in which there are 3 homologous chromosomes instead of 2 at any chromosome. Which of the following karyotypes shows a trisomy in a female?
All organisms begin as a single cell. After dividing many times, differentiation occurs. During the process of differentiation,
some genes are turned on, others are turned off
genes are removed from some cells
DNA is modified to contain different genes
A human egg cell might contain
22 autosomes and an X chromosome
22 autosomes and a Y chromosome
45 autosomes and an X chromosome
45 autosomes and a Y chromosome
Which of the following genetic conditions is screened for in all newborns because it can be completely controlled by diet? (3.2.3)
skin cancer
diabetes
heart disease
PKU
A pair of identical twins were separated at birth and raised by different parents. Both were found to have the gene for type II diabetes, but only one developed the disease. What could explain this?
mutation and genetic recombination
independent assortment
environmental influence
segregation of alleles
Human males are much more likely to have hemophilia than human females. This is the case because:
the gene for hemophilia is carried on the Y chromosome
hemophilia is carried on autosomes
the gene for hemophilia is sex-linked
hemophilia is a contagious disease to which males are more susceptible
Chromosomal disorder where a male has an extra X chromosome
Down syndrome
Turners
Jacobs
Klinefelter's
What is the name of the human chromosomal disorder that results in an extra chromosome #21?
Down syndrome
Turners
Jacobs
Klinefelter's
What genetic disorder results in 45 chromosomes in each of the body cells?
Turner's syndrome
Down syndrome
Klinefelter's
Jacobs syndrome
Name the human mutation in cell receptor protein that affects transport of salt across the cell membrane.
cystic fibrosis
hemophilia
diabetes
PKU
