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WorksheetsGenetics Review
Total questions: 20
Worksheet time: 24mins
Name
Class
Date
1.
How would you describe this genotype?
Bb
Bb
a)
Homozygous Dominant
b)
Homozygous Recessive
c)
Heterozygous
2.
How would you describe this genotype?
dd
dd
a)
Homozygous Dominant
b)
Homozygous Recessive
c)
Heterozygous
3.
How would you describe this genotype?
HH
HH
a)
Homozygous Dominant
b)
Homozygous Recessive
c)
Heterozygous
4.
In snapdragon flowers, Red is completely dominant to White. What would be the phenotype of a Rr plant?
a)
Red
b)
White
c)
homozygous
d)
heterozygous
5.
In pea plants, smooth peas are dominant to wrinkled peas. What would be the phenotype of a "ss" plant?
a)
smooth
b)
wrinkled
c)
homozygous
d)
heterozygous
6.
Red flowers are dominant to white flowers. If two heterozygous plants are crossed, what percent chance is there of having a plant with white flowers?
a)
100%
b)
75%
c)
0%
d)
25%
7.
Again, red flowers are dominant to white flowers. Assume that the male alleles are placed on the top of the punnett sguare and the female alleles on the side. What is the phenotype of the female plant?
a)
Red
b)
White
c)
Homozygous
d)
Heterozygous
8.
How many chromosomes do humans have in their body cells?(skin cells, stomach cells...)
a)
42
b)
44
c)
23
d)
46
9.
If an animal has 20 chromosomes in their brain cells, how many are in their gametes? (sex cells)
a)
40
b)
20
c)
10
d)
60
10.
A cells has a haploid number of 20. What would be the diploid number before meiosis?
a)
20
b)
40
c)
10
d)
23
11.
The allele or trait that is visible and obeservable in an organism is defined as the __ allele.
a)
recessive
b)
homoztgous
c)
heterozygous
d)
dominant
12.
The allele that is hidden or not seen in heterozygous individuals.
a)
dominant allele
b)
recessive allele
c)
homologous chromosomes
d)
heterozygous chromosomes
13.
In the second generation-how many people are carriers of the trait?
a)
2
b)
3
c)
5
d)
6
14.
How many girls did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
15.
How many people in this whole pedigree have the trait/disease?
a)
2
b)
3
c)
4
d)
6
16.
What is the genotype of the great-grandfather? (Individual 2)
a)
A_
b)
aa
c)
Aa
d)
AA
17.
How many girls in this family express this recessive disorder?
a)
4
b)
5
c)
6
d)
7
18.
Given that this is a recessive pedigree...
What is the genotype of individual II-3?
What is the genotype of individual II-3?
a)
aa
b)
Aa
c)
AA
19.
FF crossed with ff, what is the probability of the DOMINANT PHENOTYPE appearing in the offspring generation?
a)
0%
b)
25%
c)
50%
d)
100%
20.
R=round seed
r=wrinkled seed.
Cross a homozygous round with a wrinkled. Which statement predicts the results?
r=wrinkled seed.
Cross a homozygous round with a wrinkled. Which statement predicts the results?
a)
offspring will be Rr
b)
offspring will be RR
c)
round seeds will be recessive to wrinkled
d)
Wrinkled will be observed in half of offspring
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