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Basic Punnett Squares
Test Description: Do one factor crosses using dominant and recessive traits
Instructions: Answer all questions to get your test result.
1) Which of the following would be a GOOD symbol for a recessive allele?
A
G
B
o
C
D
D
e
2) Which of the following would be a GOOD symbol for a dominant allele?
A
S
B
N
C
h
D
q
3) How many genes do you have for one particular trait/protein?
A
2
B
many
C
4
D
1
4) Why do you have two genes for each trait/protein?
A
Because body parts often come in pairs ex. eyes, ears
B
Because DNA is double-stranded
C
Because you have a male and a female parent
D
Because you will have a backup if one fails
5) What is/are the word(s) that describe this symbol: HH?
A
heterozygous dominant
B
homozygous recessive
C
heterozygous
D
homozygous dominant
6) What is/are the word(s) that describe the symbol: Hh?
A
heterozygous
B
homozygous dominant
C
heterozygous recessive
D
homozygous recessive
7) What is/are the word(s) that describe the symbol: hh
A
homozygous recessive
B
heterozygous
C
heterozygous dominant
D
homozygous dominant
8) Homozygous dominant crossed with homozygous dominat. What is the genotypic ratio in their offspring?
A
1:2:1
B
1:1
C
1:0
D
3:1
9) Heterozygous crossed with heterozygous. What is the phenotypic ratios in their offspring?
A
1:2:1
B
3:1
C
1:0
D
1:1
10) What do the letters on the outside of the Punnet square represent
A
Genotypes of the parents
B
Genes that are common in the population
C
Genotypes of the offspring
D
Gametes from the parents
*select an answer for all questions
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