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 31 of 32
- A. Prophase I
- B. Metaphase I
- C. Telophase I
- D. Anaphase I
Explanation: [A] During prophase no separation of chromosomes occurs instead they only condense and thicken during prophase[B] During Metaphase the…
Correct answer: Anaphase I- A. 11
- B. 22
- C. 21
- D. 12
Explanation: [A] Gene for albinism, sickle cell anaemia and leukaemia is present at chromosomes number 11.[B] Not present at chromosomes 22.[C] Not…
Correct answer: 11- A. Mitosis
- B. Interphase
- C. Meiosis
- D. Cell Cycle
Explanation: The period of life cycle of cell (cell cycle) between two consecutive divisions is termed as the interphase or misleadingly called resting…
Correct answer: Interphase- A. Prophase
- B. Metaphase
- C. Telophase
- D. Anaphase
Explanation: Telophase is the fifth and final phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a…
Correct answer: Telophase- A. Down's syndrome
- B. Klinefelter's syndrome
- C. Turner's syndrome
- D. XYZ syndrome
Explanation: In Down's syndrome, there are three copies, either complete or partial, of chromosome 21.
Correct answer: Down's syndrome- A. Klinefelter's syndrome
- B. Down's syndrome
- C. Turner's syndrome
- D. Edward's syndrome
Explanation: The correct answer is Klinefelter's syndrome. Klinefelter's syndrome is characterized by the presence of an additional X chromosome in…
Correct answer: Klinefelter's syndrome- A. 7
- B. 18
- C. 21
- D. 19
Explanation: Down's syndrome is a genetic condition in which the 21st chromosome fails to segregate, leading to physical and mental developmental delay…
Correct answer: 21608. Down's syndrome is a result of non-disjunction of_ pair of chromosomes that fails to segregate:
- A. 21st
- B. 22nd
- C. 18th
- D. 24th
Explanation: Down's syndrome, also known as trisomy 21, is a result of the non-disjunction of the 21st pair of chromosomes.
Correct answer: 21st- A. Prophase
- B. Metaphase
- C. Anaphase
- D. Telophase
Explanation: The third stage of cell division, between metaphase and telophase, during which the chromosomes move away from one another to opposite…
Correct answer: Anaphase- A. Turner's syndrome
- B. Klinefelter's syndrome
- C. Down syndrome
- D. Jacob's syndrome
Explanation: Down syndrome is usually caused by an error in cell division called "nondisjunction." Nondisjunction results in an embryo with three…
Correct answer: Down syndrome- A. Down's Syndrome
- B. Turner's Syndrome
- C. Klinefelter's Syndrome
- D. Phenylketonuria
Explanation: Klinefelter's Syndrome is a genetic disorder that affects males and is characterized by the presence of an extra X chromosome (XXY instead…
Correct answer: Klinefelter's Syndrome- A. Trisomy 21
- B. 44 + XXY
- C. Trisomy
- D. 44 + XO
Explanation: Turner's Syndrome is characterized by the complete or partial loss of one of the X chromosomes in females.
Correct answer: 44 + XO- A. Down's syndrome
- B. Turner's syndrome
- C. Klinefelter's syndrome
- D. Jacob's syndrome
Explanation: Klinefelter's syndrome is a genetic disorder that affects males, characterized by the presence of an extra X chromosome.
Correct answer: Klinefelter's syndrome- A. Trisomy
- B. Monosomy
- C. Polysomy
- D. Disomy
Explanation: In Down syndrome, there is an additional copy of chromosome 21, resulting in three copies instead of the normal two.
Correct answer: Trisomy- A. Turner's Syndrome
- B. Jacob's Syndrome
- C. Metastasis
- D. Down's syndrome
Explanation: Non-disjunction causes an abnormal number of chromosomes in all cells, called aneuploidy, or in some cells, called mosaicism.
Correct answer: Down's syndrome- A. Turner's
- B. Down's
- C. Edward's
- D. Patau's
Explanation: Turner syndrome, a condition that affects only females, results when one of the X chromosomes (sex chromosomes) is missing or partially…
Correct answer: Turner's- A. Anaphase
- B. Metaphase
- C. Prophase
- D. Telophase
Explanation: Anaphase is the most critical phase of the mitosis, which ensures equal distribution of chromatids in the daughter cells.
Correct answer: Anaphase- A. XXX
- B. XYY
- C. XO
- D. XXY
Explanation: XO refers to a specific chromosomal condition known as Turner syndrome, which occurs in females.
Correct answer: XO- A. Mesosome
- B. polysome
- C. Nucleosome
- D. Centrosome
Explanation: Mesosomes are a convoluted membranous structure formed in a prokaryotic cell by the invagination of the plasma membrane.
Correct answer: Nucleosome- A. Prophase
- B. Metaphase
- C. Anaphase
- D. Telophase
Explanation: The correct answer is Prophase. This stage initiates the condensation of chromosomes, reaching their maximum compaction.
Correct answer: Prophase