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 30 of 32
- A. 25
- B. 50
- C. 100
- D. 125
Explanation: 100 wheat grains will develop from 100 zygotes.100 zygotes mean 100 pollen and 100 eggs are required.
Correct answer: 125- A. Two chromatids
- B. Two chromosomes
- C. Six chromatids
- D. Four chromosomes
Explanation: The term bivalent refers to a specific structure that forms during meiosis, the process of cell division that produces gametes (sex…
Correct answer: Two chromosomes- A. Amitosis
- B. Mitosis
- C. Meiosis I
- D. Meiosis II
Explanation: Meiosis is a type of cell division that occurs in the reproductive cells of eukaryotic organisms.
Correct answer: Meiosis I- A. Zygotene
- B. Pachytene
- C. Diplotene
- D. Diakinesis
Explanation: During diakinesis, the condensation of chromosomes is maximum.During this stage, the homologous chromosomes become tightly coiled and…
Correct answer: Diakinesis- A. Anaphase I
- B. Anaphase II
- C. Metaphase II
- D. Both A and B
Explanation: In anaphase II, the centromeres separate and the sister chromatids-now individual chromosomes-move toward the opposite poles of the cell.
Correct answer: Anaphase II- A. G0
- B. G1
- C. G2
- D. S
Explanation: G0 phase: This phase is a resting phase of the cell cycle. Cells in G0 are not dividing, but they are still metabolically active.
Correct answer: S- A. DNA replication
- B. Mutations
- C. Translation
- D. Transcription
Explanation: Option A: DNA replication is the process by which DNA is copied in preparation for cell division.
Correct answer: Mutations- A. 1, 2, 4, 3
- B. 2, 3, 1, 4
- C. 3, 4, 1, 2
- D. 3, 4, 2, 1
Explanation: Mitosis has four stages: prophase, metaphase, anaphase, and telophase. Mitosis, a process of cell duplication, or reproduction, during…
Correct answer: 3, 4, 1, 2- A. Nerve cells
- B. Cells of cornea
- C. Cells of lens
- D. None of these
Explanation: Cells of the cornea of the eye do not enter G0 phase. Whereas, nerve cells and cells of the lens remain in G0 phase for the life span of…
Correct answer: Cells of cornea- A. X chromosomes
- B. Y chromosomes
- C. Sex chromosomes
- D. Autosomes
Explanation: Twenty-two of these pairs, called autosomes, look the same in both males and females.
Correct answer: Autosomes591. Except during nuclear division, the nucleus has the chromosome in a loosely coiled state known as:
- A. Genes
- B. Ribosomes
- C. DNA
- D. Chromatin
Explanation: Chromatin are loosely coiled fibres of DNA and histone proteins present in the nucleus.
Correct answer: Chromatin- A. Satellite
- B. Kinetochore
- C. Nucleolar organizer
- D. Telomeres
Explanation: A telomere is a region of repetitive nucleotide sequences at each end of a chromatid, which protects the end of the chromosome from…
Correct answer: Telomeres593. During meiosis, the homologous chromosomes come together and form pairs, this process is called:
- A. Linkage
- B. Synapsis
- C. Pairing
- D. Crossing over
Explanation: During meiosis, homologous chromosomes come together and form pairs through a process called "synapsis." The synapsis involves the…
Correct answer: Synapsis- A. Prophase
- B. Interphase
- C. Anaphase
- D. Telophase
Explanation: The DNA content of the cell doubles during S-phase that probably occurs during interphase of cell cycle.
Correct answer: Interphase- A. Diploid cells
- B. Polyploid cells
- C. Both A and B
- D. None of these
Explanation: In diploid and polyploid cells, more than one complete cells of chromosomes are present so homologous chromosomes can be formed.
Correct answer: Both A and B- A. Autosome 9.
- B. Autosome 7.
- C. Autosome 1.
- D. Autosome 3.
Explanation: b) Autosome 7: This is the correct option. The genes for blue opsin (a type of photoreceptor in the eye) are located on chromosome 7…
Correct answer: Autosome 7.- A. Klinefelter's Syndrome
- B. Down's Syndrome
- C. Jacob's Syndrome
- D. Edward's Syndrome
Explanation: Explanation:XXY chromosomes in a male cause Klinefelter's syndrome.This option is not correct.
Correct answer: Klinefelter's Syndrome- A. XO
- B. XXY
- C. XYY
- D. XXX
Explanation: [A] XO chromosomal abnormality results in Turner syndrome which does not causes aggression and antisocial behaviour[B] XXY,Klinefelter…
Correct answer: XYY- A. Chromosomal rearrangement
- B. Transposition of gene
- C. Chromosomal aberration
- D. Point mutation
Explanation: Option [A] chromosomal rearrangement includes inversions,reciprocal translocations that can have effect on gene expression through…
Correct answer: Point mutation- A. Number
- B. Types
- C. Number, types and chemical composition
- D. Number and types
Explanation: [A] Does not refer only on number of chromosome[B] does not refer to the type of chromosomes only[C] does not refer to chemical…
Correct answer: Number and types