Multiple Choice Questions
1. Who is considered the father of modern genetics?
a) Charles
Darwin
b) Gregor
Mendel
c) Thomas
Hunt Morgan
d) Alfred
Wallace
2. Which of the following is an example of a
dihybrid cross?
a) Crossing
a tall pea plant with a dwarf pea plant
b) Crossing
a plant with yellow round seeds and a plant with green wrinkled seeds
c) Crossing
a red-flowered plant with a white-flowered plant
d) Crossing
a purebred black rabbit with a purebred white rabbit
3. What is the phenotypic ratio observed in the F2
generation of a monohybrid cross with complete dominance?
a) 3:1
b) 1:2:1
c) 9:3:3:1
d) 1:1:1:1
4. Which type of inheritance pattern results in
offspring with a blend of parental traits?
a) Complete
dominance
b)
Incomplete dominance
c)
Codominance
d) Epistasis
5. What is the genotype of a person with type O
blood?
a) IAIA
b) IBIB
c) IAIB
d) ii
6. Which of the following best describes a test
cross?
a) A cross
between two homozygous individuals
b) A cross
between two heterozygous individuals
c) A cross
between an individual with an unknown genotype and a homozygous recessive
individual
d) A cross
between an individual with a dominant phenotype and one with a recessive
phenotype
7. In a dihybrid cross between two heterozygous
individuals (AaBb × AaBb), what is the expected phenotypic ratio?
a) 9:3:3:1
b) 1:2:1
c) 3:1
d) 1:1
8. What term describes the situation where one gene
masks the effect of another gene at a different locus?
a)
Codominance
b)
Incomplete dominance
c) Epistasis
d) Polygenic
inheritance
9. Which condition is an example of codominance in
humans?
a) Sickle
cell anemia
b) Blood
type AB
c) Red-green
color blindness
d)
Hemophilia
10. Which of the following inheritance patterns
involves multiple genes contributing to a single trait?
a)
Polygenic inheritance
b)
Pleiotropy
c)
Epistasis
d)
Codominance
11. In Mendelian genetics, what is the expected
genotypic ratio of the F2 generation in a monohybrid cross?
a) 3:1
b) 1:2:1
c) 9:3:3:1
d) 1:1
12. Which genetic disorder is caused by a recessive
allele?
a)
Huntington's disease
b) Cystic
fibrosis
c) Marfan
syndrome
d)
Achondroplasia
13. What does a Punnett square help predict?
a) The
likelihood of a genetic mutation
b) The
physical traits of an organism
c) The
possible genotypes of offspring from a genetic cross
d) The
sequence of DNA in a gene
14. Which of the following best describes
pleiotropy?
a) One gene
influencing multiple phenotypic traits
b) Multiple
genes influencing a single trait
c) A single
gene masking the effect of another gene
d) Two
alleles both being fully expressed in a heterozygote
15. If a woman with type A blood (IAi) has a child
with a man with type B blood (IBi), what blood types could their children
potentially have?
a) A, B,
AB, O
b) A, AB
c) B, O
d) A, B
Answer Key
1. b) Gregor Mendel
2. b) Crossing a plant with yellow round seeds and a
plant with green wrinkled seeds
3. a) 3:1
4. b) Incomplete dominance
5. d) ii
6. c) A cross between an individual with an unknown
genotype and a homozygous recessive individual
7. a) 9:3:3:1
8. c) Epistasis
9. b) Blood type AB
10. a) Polygenic inheritance
11. b) 1:2:1
12. b) Cystic fibrosis
13. c) The possible genotypes of offspring from a
genetic cross
14. a) One gene influencing multiple phenotypic
traits
15. a) A, B, AB, O
NOTES : Principles of Inheritance and Variation
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