Biology

Cell Cycle and Chromosomes

1,348 Questions

Explore a curated list of questions covering the cell cycle, mitosis, and meiosis. Topics include DNA replication, chromosomal structures, and genetic disorders. This material is essential for students preparing for biology and general science competitive exams.

Cell cycle eventsDNA replicationMeiosis processChromosomal structuresGenetic disorders

Cell Cycle and Chromosomes Questions

Multiple choice

Which of the following are types of human cloning?

  1. Therapeutic
  2. Replacement
  3. Reproductive

  1. 1 and 2

  2. 2 and 3

  3. 1 and 3

  4. All of these

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are three different types of artificial cloning: gene cloning, reproductive cloning and therapeutic cloning.
Gene cloning produces copies of genes or segments of DNA. Reproductive cloning produces copies of whole animals. Therapeutic cloning produces embryonic stem cells for experiments aimed at creating tissues to replace injured or diseased tissues.
 

Multiple choice

The nucleosomes

  1. are present only during mitosis

  2. consist entirely of DNA

  3. consist of DNA wound around a histone core

  4. are made of chromosomes

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The nucleosomes consist of DNA wound around a histone core.

Multiple choice

Chromosomal end is known as

  1. chromomere

  2. secondary constriction

  3. telomere

  4. telocentric

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chromosomal end is known as telomere.

Multiple choice

The type of sex determination in grasshopper is

  1. XX - XY

  2. XX - XO

  3. ZZ - ZW

  4. XY - XX
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

XX -XO type of sex determination is found in female grasshoppers. They have two X chromosomes, whereas males have only one. Female grasshoppers are described as being XX and males as XO.

Multiple choice

Down's syndrome in human is due to

  1. trisomy of sex chromosome

  2. trisomy of 11th chromosome

  3. trisomy of 21st chromosome

  4. trisomy of 12th chromosome
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Trisomy of 21st chromosome causes Down's syndrome.

Multiple choice

The person with Turner’s syndrome has

  1. 44 autosomes and XXY sex chromosomes

  2. 44 autosomes and XO sex chromosomes

  3. 44 autosomes and XYY sex chromosomes

  4. 44 autosomes and XXX sex chromosomes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is Turner's syndrome.

Multiple choice

The sex of a fruitfly is determined by

  1. Y chromosome

  2. X and Y chromosomes, the male being XY

  3. the number of X chromosomes, the male being XO

  4. Z and W chromosomes, the male being ZZ
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sex of a fruitfly is determined by X and Y chromosomes, the male being XY.

Multiple choice

The interphase of meiosis lacks G2 phase

  1. in order to maintain the ploidy level of the progeny as that of parents

  2. in order to shorten the cell cycle in meiosis

  3. in order to release it from the cell cycle

  4. in order to help the cell to divide into four
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 G2 phase is responsible for replication of the chromatin material resulting in the formation of similar sister homologous chromosomes, which maintain the ploidy status in the daughter nucleus, as in mitosis and if it occurs so in meiosis then the number of chromosomes will be doubled in the zygote and consequently in the progeny as that of parents and ploidy will be doubled in the progeny with each generation resulting in genetic abnormality.