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

What is the importance of synaptonemal complex?

  1. It mediates in pairing of homologous chromosome during prophase 1 of meiosis.

  2. It helps in chiasma formation between chromosomes.

  3. It mediates in pairing of homologous chromosomes during prophase 2 of meiosis.

  4. It mediates in pairing of homologous chromosomes during prophase of mitosis.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 During prophase 1 of meiosis, homologous chromosome pair comes closer together and they are held in pairs with the help of protein structures called synaptonemal complex.

Multiple choice

What are haploid and monoploid chromosomes?

  1. Haploid is half the number of genome in an individual while monoploid is presence of just one set of chromosomes.

  2. Haploid is n and monoploid is also n.

  3. Haploid is 2n and monoploid is n.

  4. Haploid is half the number of genome in an individual while monoploid is full set of genome.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 The gametes of an individual are haploid, i.e. they carry half the number of genome, similarly the other half comes from the gametes of the contributing parents, so that the number of genome is restored in the progeny to the parental level. Examples- Haploid of 2n is n, haploid of 4n is 2n. Similarly haploid of 6n is 3n. Monoploid means presence of just one set of chromosomes in the genome of an individual. Examples- Some species of potatoes are monoploid n. Humans are diploid, i.e. 23 (n) + 23 (n) = 46 (2n).

Multiple choice

Chromosomal ends are known as

  1. telocentric

  2. chromomere

  3. telomere

  4. secondary constriction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chromosomal ends are known as telomere. This is the correct answer.

Multiple choice

Identify the correct order of stages in prophase I of meiosis.

  1. Leptotene, pachytene, zygotene, diakinesis and diplotene

  2. Leptotene, zygotene, diakinesis, diplotene and pachytene

  3. Zygotene, diakinesis, diplotene, pachytene and leptotene

  4. Leptotene, zygotene, pachytene, diplotene and diakinesis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The correct sequence of prophase I is leptotene, zygotene, pachytene, diplotene and diakinesis.

Multiple choice

What is the position of multiple alleles?

  1. They are present on different chromosomes.

  2. They are present on different loci of the same chromosome.

  3. They are present on the same locus of same chromosomes.

  4. They are present on non-sister chromatids.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alleles are always present on the same locus of homologous chromosomes for crossing over.