✓ Board-verified
Science · 2022 · 3 marks
CBSE 2022 · Region 2 · Set 3 · Q11
What are Chromosomes? Explain how stability of the DNA of the species is ensured in sexually reproducing organisms.
What are Chromosomes ? Explain how stability of the DNA of the species is ensured in sexually reproducing organisms.
Marking-scheme solution
Thread-like structures present in the nucleus carrying genetic material.
Each cell will have two copies of each chromosome, one each from the male and female parents. Every germ cell will take one chromosome from each pair.
When two germ cells combine, they restore the number of chromosomes, ensuring the stability of the species.
More from Heredity
- Assertion: In human beings, males have 'XX' sex chromosomes and females have 'XY' sex chromosomes. Reason (R): Sex of the child is determined at the…2024
- In human beings, there are 23 pairs of chromosomes. Out of these 23 pairs of chromosomes (i.e. 46 chromosomes), 22 pairs of chromosomes are called…2025
- Explain how the proteins control the 'characteristics' in an organism with the help of an example of 'short height' trait in pea plant. Name the…2025
- Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds were crossed with each other which produced F_1…2026
- In an experiment to study independent inheritance of two separate traits: shape and colour of seeds, the ratio of the different combinations in F_2…2024
- Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular trait in each generation. He…2022
- "In human beings the genes inherited from the parents decide whether the newborn individual is male or female." Explain this statement with the help…2025
- List two differences between dominant traits and recessive traits. What percentage of pea plants in the F_2 generation were with yellow seeds in…2024
CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.