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WorksheetsUnit 6 genetics review
Total questions: 13
Worksheet time: 7mins
Name
Class
Date
1.
Set up the gametes for a dihybrid cross for the parent genotype RrYy
a)
RY, ry
b)
RY, Ry, rY, ry
c)
Rr, Yy
d)
RY, RY, ry, ry
2.
In the following dihybrid cross, a short tail (S) is dominant to a long tail (s) and brown fur (B) is dominant to white fur (b). What is the fraction of cats that have a short tail and white fur?
a)
4/16
b)
12/16
c)
3/16
d)
1/16
3.
Different forms of a gene controlling a particular trait are called
a)
Codominant
b)
Heterozygous
c)
Alleles
d)
Homozygous
4.
Color blindness is a sex-linked recessive trait (c) carried on the X chromosome. Using the pedigree with the key provided, what is the genotype of person II-4?
a)
XCXc
b)
XCXC or XCXc
c)
XcXc
d)
Not enough information to determine
5.
If an organism with a homozygous dominant trait was mated in a test cross, all the F1 offspring would be
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
50% homozygous; 50% heterozygous
6.
A purebred red flower and a purebred white flower are crossed and the offspring produced are all pink. What type of inheritance is this?
a)
Codominant
b)
Incomplete dominant
c)
Basic dominant/recessive
d)
Multiple alleles
7.
A family has four children and they are all boys. What chance would there be that the next child would also be a boy?
a)
75%
b)
50%
c)
25%
d)
20%
8.
A purebred white cow and a purebred red cow mate and the offspring are all roan, which is where the red and white genes are expressed equally. What type of inheritance is this?
a)
Codominant
b)
Incomplete dominant
c)
Basic dominant/recessive
d)
Multiple alleles
9.
Some traits involve more than two genes, blood type in humans is an example. What type of inheritance is this?
a)
Codominant
b)
Incomplete dominant
c)
Basic dominant/recessive
d)
Multiple Alleles
10.
The genotype Aa, where there is one dominant and one recessive gene, is called?
a)
Homozygous recessive
b)
Homozygous dominant
c)
Heterozygous
d)
Codominant
11.
A mother has type A blood and her baby has type O blood. She claims the father is a man who has type AB blood. Can he be the father?
a)
Yes, there is a chance!
b)
No way! It's not possible.
c)
Not enough information is provided.
12.
More than one gene determines the phenotype for one trait. Hair and skin color is an example. What is this called?
a)
Codominant
b)
Polygenic traits
c)
Incomplete dominance
d)
Multiple Alleles
13.
Color blindness is a recessive trait that is sex-linked. A female child is born color blind. Assuming there were no mutations, what are the likely genotypes of her father and mother?
a)
XcY, XCXc
b)
XCY, XCXc
c)
XCY, XcXc
d)
XcY, XCXC
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