Free Chromosomes MCQs with Answers
633 Chromosomes MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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633 questions · page 16 of 32
- A. Migration
- B. Mutation
- C. Genetic drift
- D. Selection
Explanation: Random mutations are the ultimate source of genetic variation. Mutations are likely to be rare and most mutations are neutral or…
Correct answer: Mutation- A. Polymorphic
- B. Heteromorphic
- C. Homomorphic
- D. Automorphic
Explanation: The 23rd pair in man is heteromorphic and defines the gender of the person.
Correct answer: Heteromorphic- A. It increases frequency of an allele.
- B. It is the same as disruptive selection.
- C. It increases genetic diversity.
- D. It removes variation from the population.
Explanation: The statement that best describes the impact of purifying selection is: "It removes variation from the population." Purifying selection…
Correct answer: It removes variation from the population.- A. Mitosis
- B. Meiosis
- C. Cytoplasm
- D. Nucleus
Explanation: The doubling of DNA material occurs in the process of mitosis as parent cell divides into two daughter cells having same number of…
Correct answer: Mitosis- A. Mendel
- B. Boweri
- C. Sutton
- D. Fleming
Explanation: The term was discovered by the German scientist Heinrich Wilhelm Waldeyer in 1888, it referred to chromatin at the time which was later…
Correct answer: Fleming- A. Sutton
- B. Sutton and Walther Flemming
- C. Correns and Robert Brown
- D. Einstein and Mendel
Explanation: The chromosomal theory of inheritance was proposed by Walter Sutton which states that chromosomes are the units of genetic heredity.
Correct answer: Sutton- A. Telomeres
- B. Centromeres
- C. Kinetochores
- D. Satellites
Explanation: The ends of chromosomes are called telomeres. They consist of repeating non-coding nucleotide sequences.
Correct answer: Telomeres- A. 3 pairs
- B. 4 pairs
- C. 2 pairs
- D. 1 pair
Explanation: Humans have 2 sex chromosomes (1 pair), i.e. the X and Y chromosomes. Females have XX chromosomes whereas males have XY chromosomes.
Correct answer: 1 pair- A. Waldeyer
- B. Coloumb
- C. Strasburger
- D. Flemming
Explanation: Walther Flemming was the first person to observe chromosomes while examining the rapidly dividing cells of salamander larvae and described…
Correct answer: Flemming- A. Sutton
- B. Flemming
- C. Boweri
- D. Mendel
Explanation: The term 'chromosome' was first time proposed by Walther Flemming. Chromosomes are thread-like structures that appear inside the nucleus…
Correct answer: Flemming- A. DNA dependent DNA polymerase
- B. DNA dependent RNA polymerase
- C. RNA dependent DNA polymerase
- D. RNA dependent RNA polymerase
Explanation: Conversion of - ssRNA to +ssRNA is mediated by "RNA-dependent RNA Polymerase".
Correct answer: RNA dependent RNA polymerase- A. Chromatic body
- B. Nuclear region
- C. Nuclear Body
- D. All of above
Explanation: Nucleotides are present in chromosomes that are located in the nucleus.
Correct answer: All of above- A. RNA coiling
- B. Gene expression
- C. DNA formation
- D. Protein synthesis
Explanation: Histones are involved in gene expression, as they play a role in regulating the accessibility of DNA to the transcriptional machinery.
Correct answer: Gene expression- A. Diploid cells
- B. Polyploid cells
- C. Both Options A and B are correct
- D. None of these options is correct
Explanation: All cells have homologous chromosomes except for the reproductive cells of higher organisms.
Correct answer: Diploid cells- A. Transduction
- B. Transformation
- C. Binary fission
- D. Conjugation
Explanation: Option A: Transduction is a method of genetic transfer in bacteria mediated by bacteriophages (viruses that infect bacteria).
Correct answer: Transformation- A. 8
- B. 18
- C. 16
- D. 32
Explanation: Somatic cells are diploid cells and if one of an organism's gametes contains 16 chromosomes then one of its somatic cells will contain 32.
Correct answer: 32- A. Hybrid
- B. The P generation
- C. Mutants
- D. The F2 generation
Explanation: When two individuals of different pure breeding strains or genotypes are crossed, their offspring are known as hybrids.
Correct answer: Hybrid- A. Haploid
- B. Diploid
- C. Single nucleus
- D. None of these
Explanation: Most multicellular organisms are diploid (2n). Because the diploid stage is the most obvious stage in the life cycle, usually only gametes…
Correct answer: Diploid- A. 30,000 to 40,000
- B. 40,000 to 50,000
- C. 10,000 to 15,000
- D. 20,000 to 25,000
Explanation: Scientists estimate that the human genome, for example, has about 20,000 to 25,000 protein-coding genes.
Correct answer: 20,000 to 25,000- A. Diploid
- B. Haploid
- C. Unicellular
- D. None of these
Explanation: Organisms that have one copy of each gene on each chromosome are called haploid organisms.
Correct answer: Haploid