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

The pattern of sex determination in mammals including human beings is

  1. ZO-ZZ type

  2. ZW-ZZ type

  3. XX-XO type

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

This type of sex determination occurs in insects and mammals including human beings. Here, the females have two identical homologous sex chromosomes designated as XX and the males have two dissimilar sex chromosomes designated as X and Y. Thus, females are homogametic, producing only one type of ovum, and males are heterogametic, producing two types of gametes: one half carrying the X chromosome and the other half carrying the Y chromosome.

Multiple choice

The genes which are located apart in the chromosome shows

  1. incomplete linkage

  2. complete linkage

  3. epistasis

  4. linkage groups

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

The genes distantly located in the chromosome show incomplete linkage because they have a chance of separation by crossing over and of going into different gametes and offspring.

Multiple choice

The exchange of the corresponding parts of the adjacent paternal and maternal chromatids during meiosis is known as

  1. Chromosomal Mapping

  2. Genetic Variation

  3. Crossing Over

  4. Linkage

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

Genetic recombination crossing over is the mutual exchange of the corresponding parts of the adjacent paternal and maternal chromatids of the pachytene of meiosisI, producing new combinations of genes. The chromatids resulting from the interchange of segments are known as the cross over recombinants and the chromatids that remain intact are called non-crossover parental chromatids.

Multiple choice

Which of the following is due to trisomy of 18 chromosomes?

  1. Autosomal abnormality that is Edward's syndrome

  2. Allosomal abnormality that is Edward's syndrome

  3. Autosomal abnormality that is Patau's syndrome

  4. Allosomal abnormality that is Patau's syndrome

  5. Autosomal abnormality that is down's syndrome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is due to trisomy of 18 chromosomes.