Q. In a dihybrid cross, what is the expected phenotypic ratio?
-
A.
1:1
-
B.
3:1
-
C.
9:3:3:1
-
D.
1:2:1
Solution
The expected phenotypic ratio in a dihybrid cross is 9:3:3:1.
Correct Answer:
C
— 9:3:3:1
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Q. What is the expected phenotypic ratio in the offspring of a monohybrid cross?
-
A.
1:1
-
B.
3:1
-
C.
9:3:3:1
-
D.
1:2:1
Solution
In a monohybrid cross, the expected phenotypic ratio of the offspring is 3:1.
Correct Answer:
B
— 3:1
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Q. What is the probability of producing a homozygous recessive offspring from two heterozygous parents?
-
A.
0%
-
B.
25%
-
C.
50%
-
D.
75%
Solution
The probability of producing a homozygous recessive offspring from two heterozygous parents (Aa x Aa) is 25%.
Correct Answer:
B
— 25%
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Q. What is the role of a Punnett square?
-
A.
To determine the genotype of an organism
-
B.
To predict the probability of offspring genotypes
-
C.
To identify mutations
-
D.
To analyze genetic disorders
Solution
A Punnett square is used to predict the probability of offspring genotypes from parental genotypes.
Correct Answer:
B
— To predict the probability of offspring genotypes
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Q. What is the term for an organism's genetic makeup?
-
A.
Phenotype
-
B.
Genotype
-
C.
Allele
-
D.
Locus
Solution
The genetic makeup of an organism is referred to as its genotype.
Correct Answer:
B
— Genotype
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Q. What is the term for different forms of a gene?
-
A.
Chromosomes
-
B.
Alleles
-
C.
Genotypes
-
D.
Phenotypes
Solution
Different forms of a gene are called alleles.
Correct Answer:
B
— Alleles
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Q. What type of inheritance pattern is observed in blood type AB?
-
A.
Complete dominance
-
B.
Incomplete dominance
-
C.
Codominance
-
D.
Polygenic inheritance
Solution
Blood type AB exhibits codominance, where both A and B alleles are expressed.
Correct Answer:
C
— Codominance
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Q. Which genetic disorder is caused by a single gene mutation?
-
A.
Down syndrome
-
B.
Cystic fibrosis
-
C.
Turner syndrome
-
D.
Klinefelter syndrome
Solution
Cystic fibrosis is caused by a mutation in a single gene, the CFTR gene.
Correct Answer:
B
— Cystic fibrosis
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Q. Which of the following describes incomplete dominance?
-
A.
Both alleles are fully expressed
-
B.
One allele is completely dominant
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C.
The phenotype is a blend of both alleles
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D.
Only one allele is expressed
Solution
Incomplete dominance occurs when the phenotype is a blend of both alleles.
Correct Answer:
C
— The phenotype is a blend of both alleles
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Q. Which of the following is an example of a sex-linked trait?
-
A.
Color blindness
-
B.
Height
-
C.
Blood type
-
D.
Cystic fibrosis
Solution
Color blindness is a classic example of a sex-linked trait, often carried on the X chromosome.
Correct Answer:
A
— Color blindness
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