by DeepWebLabs
CBSE-CLASS-XII SERIES
Biology

Inheritance Of Two Genes

11 previous year questions.

Volume: 11 Ques
Yield: Medium

High-Yield Trend

11
2024

Chapter Questions
11 MCQs

01
PYQ 2024
medium
biology ID: cbse-cla
(a) Draw a diagram of a human sperm. Label any four parts and write their functions.
02
PYQ 2024
medium
biology ID: cbse-cla

(b) Explain the events which occur within a female Anopheles mosquito after it has sucked blood from a malaria patient.

03
PYQ 2024
medium
biology ID: cbse-cla
Study the graph given below that represents the changes in the thickening of the uterine wall in women β€˜X’ and women β€˜Y’ over a period of one month: \textit{(Refer to the provided graph.)}
What does the graph with respect to woman β€˜X’ and woman β€˜Y’ indicate? Give a suitable reason.
04
PYQ 2024
medium
biology ID: cbse-cla
Consider the given data of a hypothetical small portion of mRNA that codes for a functional polypeptide chain and answer the questions that follow:
mRNA Sequence: 5’– UCAUUAACCCAGAUCUUCUUAAAAGGA –3’
How many amino acids will be formed from the given codons, if substitution of β€˜U’ by β€˜C’ takes place at the 5th codon? Explain your answer.
05
PYQ 2024
medium
biology ID: cbse-cla
Which of the chromosome in a human possesses the least number of genes?
1
21\textsuperscript{st} chromosome
2
16\textsuperscript{th} chromosome
3
X chromosome
4
Y chromosome
06
PYQ 2024
medium
biology ID: cbse-cla
The question consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
1
Both (A) and (R) are true and (R) is the correct explanation of (A).
2
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3
(A) is true, but (R) is false.
4
(A) is false, but (R) is true.
Assertion (A): Communities that comprise of more species tend to be more stable.
Reason (R): A higher number of species results in less year-to-year variation in total biomass.
07
PYQ 2024
medium
biology ID: cbse-cla
The question consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
1
Both (A) and (R) are true and (R) is the correct explanation of (A).
2
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3
(A) is true, but (R) is false.
4
(A) is false, but (R) is true.
Assertion (A): In birds, the sex of the offspring is determined by males.
Reason (R): Males are homogametic while females are heterogametic.
08
PYQ 2024
medium
biology ID: cbse-cla
The question consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
1
Both (A) and (R) are true and (R) is the correct explanation of (A).
2
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3
(A) is true, but (R) is false.
4
(A) is false, but (R) is true.
Assertion (A): In molecular diagnosis, single-stranded DNA or RNA tagged with a radioactive molecule is called a probe.
Reason (R): A probe always searches and hybridises with its complementary DNA in a clone of cells.
09
PYQ 2024
medium
biology ID: cbse-cla
The question consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
1
Both (A) and (R) are true and (R) is the correct explanation of (A).
2
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3
(A) is true, but (R) is false.
4
(A) is false, but (R) is true.
Assertion (1): AIDS is a syndrome caused by HIV.
Reason (R): HIV is a virus that damages the immune system with DNA as its genetic material.
10
PYQ 2024
medium
biology ID: cbse-cla
If the sequence of nitrogen bases of the coding strand in a transcription unit is 5 –ATGAATG–3 , the sequence of bases in its RNA transcript would be:
1
5 –AUGAAUG–3
2
5 –UACUUAC–3
3
5 –CAUUCAU–3
4
5 –GUAAGUA–3
11
PYQ 2024
medium
biology ID: cbse-cla
Name the nematode (scientific name) that infects the roots of tobacco plant and reduces its yield.