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WorksheetsGenetics Review
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
An organism's phenotype describes its __________.
a)
genetic makeup
b)
physical appearance
2.
What do you call a section of DNA that codes for a specific trait?
a)
nucleus
b)
chromosome
c)
gene
d)
DNA
3.
How many chromosomes are found in human egg and sperm cells?
a)
20
b)
23
c)
26
d)
46
4.
__________ worked with pea plants to prove that traits are passed from parent to offspring.
a)
Reginald Punnett
b)
Gregor Mendel
5.
An organism's genotype describes its __________.
a)
genetic makeup
b)
physical appearance
6.
A dominant trait shows up __________.
a)
only when two dominant alleles are present
b)
only when one dominant allele is present
c)
when at least one recessive allele is present
d)
when at least one dominant allele is present
7.
A recessive trait only shows up when __________.
a)
two dominant alleles are present
b)
one dominant allele is present
c)
two recessive alleles are present
d)
at least one dominant allele is present
8.
If you cross two parents, both with genotype Bb, what percentage of children will have brown eyes?
a)
25%
b)
50%
c)
75%
d)
100%
9.
Purebred is another word for __________, while hybrid is another word for __________.
a)
dominant; recessive
b)
recessive; dominant
c)
homozygous; heterozygous
d)
heterozygous; homozygous
10.
The two different forms of a gene are called _________.
a)
zygotes
b)
traits
c)
phenotypes
d)
alleles
11.
If you cross the genotype GG with genotype Gg, what is the ratio of purebred to hybrid?
a)
2:2
b)
3:1
c)
4:0
d)
1:3
12.
What word describes how traits are passed from parent to offspring?
a)
Alleles
b)
Dominance
c)
Probability
d)
Heredity
13.
Plant height is T = tall and t = short. Flower color is P = purple and p = white. Which genotype is NOT possible for a tall plant with purple flowers?
a)
TtPp
b)
TTPP
c)
TTPp
d)
ttpp
14.
Scientists use __________ to show what genotype combinations are possible.
a)
Punnett Square
b)
Mendel Square
c)
Madison Square
d)
Times Square
15.
How many cycles of cell division occur in meiosis?
a)
1
b)
2
c)
3
d)
4
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