NEET Biology: Principles of Inheritance and Variation — Practice Set 9

Q1. Which of the following is an incorrect statement about the chromosomal theory of inheritance?

A. It was proposed by Sutton and Boveri.
B. It states that genes are located on chromosomes.
C. It suggests that alleles segregate independently during meiosis.
D. It was developed based on Mendel’s experiments on fruit flies.

Q2. Which term describes a genetic cross between an individual of unknown genotype and a homozygous recessive individual?

A. Back cross
B. Test cross
C. Dihybrid cross
D. Monohybrid cross

Q3. Which type of mutation leads to a change in the number of chromosomes?

A. Point mutation
B. Frameshift mutation
C. Aneuploidy
D. Silent mutation

Q4. Which of the following statements about pleiotropy is correct?

A. One gene influences multiple traits.
B. Multiple genes control a single phenotype.
C. Pleiotropy occurs only in plants.
D. It follows Mendel’s Law of Segregation.

Q5. Which scientist’s work on fruit flies led to the discovery of linkage and recombination?

A. Gregor Mendel
B. Thomas Hunt Morgan
C. Watson and Crick
D. Sutton and Boveri

Q6. Which of the following statements about sex determination is correct?

A. Humans follow the XY sex determination system.
B. Birds follow the XO sex determination system.
C. Males in humans have two X chromosomes.
D. Sex determination in all organisms is controlled by the same genetic mechanism.

Q7. Which of the following statements regarding the Law of Segregation is correct?

A. It states that two alleles for a trait separate during gamete formation.
B. It explains why linked genes are always inherited together.
C. It applies only to dominant alleles.
D. It was discovered through dihybrid crosses only.

Q8. Which of the following is an incorrect statement about Turner’s syndrome?

A. It results from monosomy of the X chromosome.
B. Individuals with Turner’s syndrome have a 45, XO karyotype.
C. It affects only males.
D. Affected individuals are usually sterile.

Q9. Which of the following is an incorrect statement about co-dominance?

A. Both alleles are fully expressed in heterozygous individuals.
B. AB blood group is an example of co-dominance.
C. One allele completely suppresses the other in co-dominance.
D. Co-dominance differs from incomplete dominance.

Q10. Which type of inheritance pattern is observed in polygenic traits like human skin color?

A. Mendelian inheritance
B. Polygenic inheritance
C. Co-dominance
D. Incomplete dominance

Biology — Principles of Inheritance and Variation

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Which of the following is an incorrect statement about the chromosomal theory of inheritance?

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