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WorksheetsGenetics Problems
Total questions: 25
Worksheet time: 35mins
Name
Class
Date
1.
Females-XX; MalesXY. A couple has 4 girls. What is the chance the next child will be a boy?
a)
75%
b)
100%
c)
25%
d)
50%
2.
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
a)
Incomplete Dominance
b)
Co dominance
c)
Independent assortment
d)
Recessive inheritance
3.
Snap dragon color is a incomplete dominant trait. A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?
a)
Red
b)
Red and White
c)
White
d)
Pink
4.
In guinea pigs, the alleles for black hair(B) is dominant to the allele for brown hair(b). Two black-haired guinea pigs are crossed. One of the pigs is homozygous for black hair and one is heterozygous. What percentage of their offspring are expected to have black hair?
a)
25%
b)
50%
c)
75%
d)
100%
5.
Suppose a father of blood type A and a mother of blood type B have a child of type O. What blood types are possible in their subsequent children?
a)
A,B,AB and O
b)
AB and O
c)
A and B
d)
O
6.
In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R X r ?
a)
male with white eyes
b)
female with red eyes
c)
male with red eyes
d)
female with white eyes
7.
Look at this cross: XB XB x Xb Y
What proportion/percent of the male children are colorblind?
a)
100%
b)
75%
c)
25%
d)
0%
8.
H= normal blood clotting
h=hemophilia
XHXh x XHY
What is the probability that any of their offspring will have hemophilia?
a)
4/4
b)
3/4
c)
2/4
d)
1/4
9.
Why are men 16 times more likely to be color-blind than women?
a)
to be color-blind, you must have a Y chromosome
b)
males only have one copy of the gene
c)
color-blindness is caused by testosterone
d)
color-blindness is caused by the same gene as baldness
10.
Colorblindness is a recessive x-linked trait.
Which genotype represents a male with normal vision?
Which genotype represents a male with normal vision?
a)
XNXN
b)
XYN
c)
XNY
d)
XnY
11.
What must occur for a girl to be colorblind?
a)
each parent must be colorblind
b)
each parent must have the dominant allele for colorblindness
c)
each parent must have the recessive allele for colorblindness
d)
her father must have normal vision
12.
Does this pedigree show an autosomal or X-linked trait?
a)
Autosomal
b)
X-linked
13.
AB blood type is an example of what type of inheritance?
a)
complete dominance
b)
incomplete dominance
c)
codominance
d)
polygenic inheritance
14.
Imagine you are performing a cross involving seed color in garden pea plants. What F1 offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green.
a)
100 percent yellow-green seeds
b)
100 percent yellow seeds
c)
50 percent yellow, 50 percent green seeds
d)
25 percent green, 75 percent yellow seeds
15.
Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?
a)
9/16
b)
3/16
c)
1/16
d)
16/16
16.
A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?
a)
12.5%
b)
25%
c)
50%
d)
75%
17.
What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits?
a)
1/16
b)
1/4
c)
1/2
d)
3/16
18.
In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).
What is the genotype ratio for a cross between a grey fowl and a white fowl?
What is the genotype ratio for a cross between a grey fowl and a white fowl?
a)
2 BB: 2 Bb: 0 bb
b)
0 BB: 4 Bb: 0 bb
c)
0 BB: 2 Bb: 2 bb
d)
1 BB: 2 Bb: 1 bb
19.
In some carnations, flower color exhibits codominance. When crosses, Red (R) and white (W) flowers make speckled flowers (RW) that show both colors.
Complete a cross between A speckled flower and a red flower. Find the phenotype ratio.
Complete a cross between A speckled flower and a red flower. Find the phenotype ratio.
a)
2 red: 2 speckled: 0 white
b)
4 red: 0 speckled: 0 white
c)
0 red: 4 speckled: 0 white
d)
0 red: 2 speckled: 2 white
20.
A child born with blood type O could have parents with all of the following blood types except...?
a)
iAiO and iBiO
b)
iBiO and iOiO
c)
iAiO and iAiO
d)
iAiB and iOiO
21.
A couple who are both carriers for the gene for cystic fibrosis have two children who have cystic fibrosis. What is the probability that their next child will have cystic fibrosis?
a)
0%
b)
25%
c)
50%
d)
75%
22.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
23.
Huntington's Disease is a dominant trait.
What is the correct genotype for individual I-2?
What is the correct genotype for individual I-2?
a)
HH
b)
Hh
c)
hh
d)
H_
24.
What type of heredity is shown in the pedigree?
a)
Sex-Linked Dominant
b)
Sex-Linked Recessive
c)
Autosomal Dominant
d)
Autosomal Recessive
25.
Is this trait (the shaded individuals) dominant or recessive?
a)
dominant
b)
recessive
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