Explanation

• A population bottleneck occurs when a large population suddenly becomes very small.
• This is usually due to disasters, diseases, or environmental changes.
• Only a few individuals survive and reproduce.
• Genetic drift becomes very strong in small populations.
• It reduces genetic diversity in the population.

Last verified on 20-05-2026

Explanation

Explanation

• Meiosis is a special type of cell division in living organisms.
• It occurs in reproductive cells (germ cells).
• It reduces chromosome number from diploid (2n) to haploid (n).
• It produces genetically different cells.
• Final result is formation of gametes.

Last verified on 20-05-2026

Explanation

• A cross between two heterozygous individuals (Aa × Aa) is a monohybrid cross.
• Each parent produces two types of gametes: A and a.
• Offspring combinations are AA, Aa, Aa, and aa.
• This gives a characteristic Mendelian ratio in genotype.
• It follows simple inheritance laws proposed by Mendel.

Last verified on 20-05-2026

Explanation

• Mendel’s law of independent assortment explains how traits are inherited independently.
• It works during gamete formation (meiosis).
• Genes are inherited independently if they are not physically linked.
• This usually happens when genes are on different chromosomes.
• It can also apply when genes are far apart on the same chromosome (due to crossing over).

Last verified on 20-05-2026

Explanation

• A cell is the basic unit of life.
• Different parts of the cell have different functions.
• Genetic material controls heredity and traits.
• It is mainly found in a specific control center of the cell.
• This control center is called the nucleus.

Last verified on 14-05-2026

Explanation

• Carbohydrates are the fastest and main source of energy.
• They are quickly converted into glucose in the body.
• Glucose is used immediately for energy production.
• They provide instant fuel for brain and muscles.

Last verified on 14-05-2026

Explanation

• Cytoplasm is the living, jelly-like material inside the cell.
• All cell organelles are embedded within it.
• It helps in transport of materials and supports cellular activities.
• It is essential for the proper functioning of the cell.

Last verified on 13-05-2026

Explanation

• Carbohydrates are the main energy-giving nutrients in an ordinary diet.
• They are broken down into glucose, which provides energy to the body.
• They are the fastest and most efficient source of energy.
• Common foods rich in carbohydrates include rice, bread, and potatoes.

Last verified on 13-05-2026

Explanation

• Vitamin K helps to make various proteins that are needed for blood clotting and the building of bones.
• Prothrombin is a vitamin K-dependent protein directly involved with blood clotting.

• Vitamin C may protect the body against the effects of pollution.
• It may also prevent blood clots and reduce bruising.

Last verified on 31-03-2026