Reproduction key terms

Gamete

A haploid reproductive cell produced by meiosis, carrying one set of chromosomes and capable of fusing with another gamete during fertilisation.

Fusion

The process by which two gametes (sperm and egg) combine to form a diploid zygote, restoring the full chromosome number.

gametes

Reproductive cells that unite during sexual reproduction to form a new organism; in animals, these are sperm and egg cells, while in flowering plants, they are pollen and egg cells.

sperm and egg cells

The male and female gametes in animals, respectively, that are involved in sexual reproduction.

sexual reproduction

A reproductive process involving the fusion of male and female gametes, resulting in offspring with mixed genetic information.

variation

The differences in genetic traits among offspring produced through sexual reproduction, contributing to diversity within a population.

Gamete formation

The process by which cells in the reproductive organs divide by meiosis to produce male and female gametes.

Meiosis

A two‑stage cell division that halves the chromosome number, producing four genetically distinct gametes.

asexual reproduction

A form of reproduction that involves only one parent, does not involve the fusion of gametes, and results in offspring that are genetically identical to the parent.

gamete fusion

The process by which male and female gametes combine during sexual reproduction to form a zygote, leading to genetic mixing.

asexual reproduction

A form of reproduction involving a single parent that produces genetically identical offspring without the fusion of gametes.

clones

In Sexual and asexual reproduction, clones means the specific Unit 4.6 idea used to answer this objective: students must explain that asexual reproduction produces genetically identical offspring called clones and involves only mitosis. Keep the term curriculum-specific by applying this boundary: DNA is the molecule; a gene is a functional section of that molecule. Do not use clones as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.

Meiosis

A type of cell division that reduces the chromosome number by half, resulting in the formation of gametes.

Gametes

Reproductive cells (sperm and egg in animals, pollen and egg in plants) that carry half the genetic information of an organism.

fertilisation

The process by which a sperm cell and an egg cell unite to form a zygote, restoring the diploid number of chromosomes.

chromosomes

Thread‑like structures within the nucleus that carry genetic material; in fertilisation the combined set from both gametes restores the full chromosome complement.

meiosis

A type of cell division that reduces the chromosome number by half, resulting in the formation of gametes.

gametes

Reproductive cells (sperm and egg in animals, pollen and egg in plants) that fuse during fertilization to form a new organism.

meiosis

A type of cell division that reduces the chromosome number by half, resulting in the formation of gametes.

genetic information

The hereditary material in a cell, which is copied before meiosis to ensure each gamete receives the correct genetic content.

Meiosis

The two‑stage cell division process that reduces the chromosome number by half, producing four haploid gametes.

Gamete

A haploid reproductive cell (sperm or egg) that contains a single set of chromosomes and is produced by meiosis.

Gamete

A haploid reproductive cell (sperm or egg) that contains half the number of chromosomes of a normal body cell.

Genetic variation

The differences in DNA sequences between individual gametes, ensuring that each gamete carries a unique combination of genes.

fertilisation

The process where male and female gametes fuse to form a zygote, restoring the full number of chromosomes.

mitosis

A type of cell division that results in two genetically identical daughter cells, crucial for growth and development after fertilisation.

meiosis

A type of cell division that reduces the chromosome number by half, producing four genetically diverse gametes.

chromosome behaviour

The specific actions and arrangements of chromosomes during the stages of meiosis, including pairing, crossing over, and segregation.

sexual reproduction

A reproductive process that involves the joining or fusion of male and female gametes, resulting in offspring with mixed genetic information.

variation

Differences in the characteristics of offspring produced through sexual reproduction, which can provide a survival advantage in changing environments.