CBSE-CLASS-XII SERIES Biology
Replication
5 previous year questions.
Volume: 5 Ques
Yield: Medium
High-Yield Trend
5
2024 Chapter Questions 5 MCQs
01
PYQ 2024
easy
biology ID: cbse-cla
If the cells in the leaves of a maize plant contain 10 chromosomes each, write the number of chromosomes in its endosperm and zygote. Name and explain the process by which an endosperm and a zygote are formed in maize.
02
PYQ 2024
medium
biology ID: cbse-cla
(a) Why does DNA replication occur within a replication fork and not in its entire length simultaneously?
03
PYQ 2024
medium
biology ID: cbse-cla
Draw a schematic diagram of the \textit{E.coli vector pBR 322 and mark the following in it:}
(a) ori
(b) rop
(c) ampicillin resistant gene
(d) tetracycline-resistant gene
(e) restriction site Bam HI
(f) restriction site EcoRI
(a) ori
(b) rop
(c) ampicillin resistant gene
(d) tetracycline-resistant gene
(e) restriction site Bam HI
(f) restriction site EcoRI
04
PYQ 2024
hard
biology ID: cbse-cla
A population of snakes lived in a desert with brown sand. Study the drawings given below showing the change in the population from βoneβ to βtwoβ over time and answer the question that follows. Brown snakes and Grey snakes are represented by alleles A/a (Dominant/recessive). 
(a) If the frequency of the recessive trait is 9% in population-one, work out the frequency of homozygous dominant and heterozygous dominant snakes.
05
PYQ 2024
medium
biology ID: cbse-cla
Why does DNA replication occur within a replication fork and not in its entire length simultaneously?