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Quiz Chapter 11: Inheritance

10 questions · Form 5 Biology Bab 10: Inheritance

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. What is the expected genotypic ratio when crossing two heterozygous individuals (Tt x Tt)?

  1. 3 : 1
  2. 1 : 2 : 1
  3. 1 : 1
  4. 9 : 3 : 3 : 1
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Answer: B

The genotypic ratio for Tt x Tt is 1 TT : 2 Tt : 1 tt.

2. What relationship exists between the alleles I^A and I^B in the human ABO blood group system?

  1. I^A is completely dominant over I^B
  2. I^B is completely dominant over I^A
  3. I^A and I^B are codominant
  4. Both I^A and I^B are recessive to allele i
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Answer: C

Alleles I^A and I^B are codominant because both antigens are fully expressed in an I^A I^B individual.

3. What are the chromosome numbers and sex chromosome composition in a normal human somatic cell of a male?

  1. 44 + XX
  2. 44 + XY
  3. 22 + X
  4. 22 + Y
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Answer: B

Human males have 44 autosomes and 2 sex chromosomes (XY), total 46 chromosomes.

4. What is Mendel's First Law of Inheritance?

  1. Law of Independent Assortment
  2. Law of Segregation
  3. Law of Dominance
  4. Law of Codominance
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Answer: B

Mendel's First Law is the Law of Segregation, which states that two alleles for a trait segregate during gamete formation.

5. What term is used to describe an individual possessing two identical alleles for a specific trait?

  1. Heterozygous
  2. Homozygous
  3. Hemizygous
  4. Dominant
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Answer: B

An individual with identical alleles (e.g., TT or tt) is homozygous.

6. Which genotype represents a person with Blood Type AB?

  1. IA IA
  2. IB IB
  3. IA IB
  4. ii
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Answer: C

Blood Type AB is caused by the presence of codominant alleles IA and IB, resulting in the IA IB genotype.

7. If a man with Blood Type O marries a woman who is homozygous for Blood Type A, what will be the blood type of all their children?

  1. Type O
  2. Type A
  3. Type AB
  4. 50% Type A, 50% Type O
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Answer: B

Father genotype is ii; mother genotype is IA IA. All children will inherit IA from mother and i from father, giving genotype IA i (Type A).

8. Why are sex-linked recessive conditions like haemophilia more common in human males than females?

  1. Males have two Y chromosomes
  2. Males possess only one X chromosome and lack a corresponding dominant allele to mask a recessive sex-linked gene
  3. The Y chromosome carries two copies of the defective gene
  4. Females cannot transmit sex-linked traits
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Answer: B

Males are heterogametic (XY) and possess only one X chromosome; therefore, a single recessive allele on the X chromosome causes the disorder.

9. In a monohybrid cross between two heterozygous tall pea plants (Tt x Tt), what is the expected phenotypic ratio of the offspring?

  1. 1 Tall : 1 Dwarf
  2. 3 Tall : 1 Dwarf
  3. 1 TT : 2 Tt : 1 tt
  4. 9 Tall : 3 Dwarf
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Answer: B

Crossing two heterozygous individuals (Tt x Tt) yields a 3:1 ratio of dominant (Tall) to recessive (Dwarf) phenotypes.

10. Which gametes can be produced by a plant with the genotype AaBb?

  1. Aa, Bb
  2. AB, Ab, aB, ab
  3. A, a, B, b
  4. AABB, aabb
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Answer: B

According to the Law of Independent Assortment, an AaBb plant produces four types of gametes in equal proportions: AB, Ab, aB, and ab.

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