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
-
Endoploidy
-
Aneuploidy
-
Endoplasma
-
Free nuclear division
-
Polyploidy
A
Correct answer
Explanation
The increase in number of chromosomes without the division of the nucleus is called endoploidy.
-
DNA duplication
-
Poleward movement of chromatids
-
Cytoplasmic cleavage
-
Chromosome segregation
-
DNA replication
B
Correct answer
Explanation
Poleward movement of chromatids takes place by centromere.
-
Submetacentric
-
Metacentric
-
Acrocentric
-
Telocentric
-
Both acrocentric and metacentric
D
Correct answer
Explanation
Telocentric chromosomes are not found in human beings.
-
Telocentric
-
Submetacentric
-
Sex chromosomes
-
Acrocentric
-
Metacentric
B
Correct answer
Explanation
Submetacentric chromosomes are L-shaped.
-
chromatin
-
chromonema
-
chromotophore
-
chromomere
-
chromophore
A
Correct answer
Explanation
The thread constituting a chromosome is called chromatin.
-
euchromosomes
-
polytene chromosomes
-
hetero chromosomes
-
mega chromosomes
-
meta chromosomes
C
Correct answer
Explanation
The chromosomes that remain condensed during interphase are called hetero chromosomes.
-
Idiogram
-
Genotype
-
Karyotype
-
Phenotype
-
Genome
C
Correct answer
Explanation
Karyotype is the expression of the phenotypic characters of chromosome at mitotic metaphase.
-
acentric
-
holocentric
-
telocentric
-
metacentric
-
dicentric
B
Correct answer
Explanation
Holocentric chromosome contains centromere in a diffused condition along its length.
-
Mutation of SOX9 gene
-
Presence of excessive androgen during in utero development
-
Translocation of SRY from the Y to an autosome
-
Chimerism with a 46, XY cell line
C
Correct answer
Explanation
Development of the testes requires the presence and function of SRY.
-
karyotyping
-
RFLPs analysis
-
enzyme assay
-
pedigree analysis
A
Correct answer
Explanation
A karyotype is used to demonstrate the number, types and appearance of chromosomes. Analysis of chromosomes of the developing foetus can be carried out with cells obtained from the amniotic fluid within the mother's uterus.
-
somatic cell genetics
-
biochemical analysis
-
behavior analysis
-
karyotyping
D
Correct answer
Explanation
A karyotype is used to show the number, types and appearance of chromosomes. Therefore, an extra X chromosome in a Klinefelter's person could be readily diagnosed by karyotyping.
-
The frequency increases severely in mothers after the age of 40.
-
The genesis is a nondisjunction when chromosomes do not separate during the first meiotic division.
-
Affected persons have an extra autosome.
-
None of these
D
Correct answer
Explanation
All statements are correct.
-
as a consequence of segregation of the X and Y chromosomes during male meiosis
-
as a consequence of the segregation of the X chromosomes during female meiosis
-
as the human eggs contain only X chromosomes
-
approximately, half of human eggs produce females
A
Correct answer
Explanation
It is the true statement because in humans the sex is determined by the sex chromosome in the sperm that fertilizes the female egg. Half of the sperm have a X-chromosome and half have a Y-chromosome.
-
an inactivated X chromosome
-
an amplified gene
-
a polytene chromosomes
-
a ribonucleoprotein particle
A
Correct answer
Explanation
One of the two X chromosomes in female somatic cells is foreseed as a densely staining body within the nucleus known as Barr body.
-
RFLP
-
EST
-
STS
-
All of the above
D
Correct answer
Explanation
All are useful tokens for genetic or physical mapping of human chromosomes.