Reproduction key terms

Variation

The presence of differences in traits among individuals within a population, arising from genetic differences such as allele combinations.

Survival advantage

The increased likelihood of an organism surviving and reproducing in a changing environment due to possessing beneficial traits.

Selective breeding

A human-controlled process of choosing parents with desirable traits to produce offspring that inherit those traits, thereby accelerating natural selection for improved food production.

Artificial selection

The intentional selection of organisms with specific characteristics for breeding, used by humans to enhance crop yields and livestock quality.

asexual reproduction

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

advantages of asexual reproduction

Benefits of asexual reproduction include faster reproduction rates, lower time and energy costs, and the ability to produce many identical offspring in favorable conditions.

sexual reproduction

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

asexual reproduction

A reproductive process that involves only one parent, does not require gamete fusion, and produces genetically identical offspring.

asexual reproduction

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

sexual reproduction

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

spores

Reproductive structures produced by fungi that can develop into new individuals without fertilisation, enabling asexual reproduction.

sexual reproduction

Fungal reproduction involving the fusion of gametes or specialised cells, producing genetically varied offspring.

runners

A method of asexual reproduction in plants where new plants grow from horizontal stems that extend from the parent plant.

bulb division

A form of asexual reproduction in which a bulb, a storage organ, divides to produce new plants, as seen in daffodils.

sexual reproduction

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

asexual reproduction

A reproductive process that involves only one parent, does not require gamete fusion, and produces genetically identical offspring.

reproduction examples

Specific instances of sexual or asexual reproduction methods that are outlined in the curriculum.

organism specificity

The concept that knowledge of reproduction is limited to the organisms explicitly mentioned in the specification.

DNA

The genetic material that carries the instructions for the development, functioning, growth, and reproduction of all known living organisms and many viruses.

Nucleus

The membrane-bound organelle in eukaryotic cells that contains the cell's genetic material (DNA) and controls cellular activities.

DNA

The genetic material in the nucleus of a cell, composed of two complementary strands that coil into a double‑helix structure.

Double helix

The three‑dimensional shape formed when two DNA strands wind around each other, giving DNA its characteristic twisted ladder appearance.

chromosome

A thread‑like structure found in the nucleus of a cell that contains DNA and proteins, and which carries genetic information.

DNA

In DNA and the genome, DNA means the specific Unit 4.6 idea used to answer this objective: students must explain that DNA is contained in structures called chromosomes. 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 DNA as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.

gene

In DNA and the genome, gene means the specific Unit 4.6 idea used to answer this objective: students must define a gene as a small section of DNA on a chromosome. 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 gene as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.

chromosome

A chromosome is a structure within the cell nucleus that contains DNA and carries genetic information.

gene

In DNA and the genome, gene means the specific Unit 4.6 idea used to answer this objective: students must explain that each gene codes for a sequence of amino acids to make a specific protein. 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 gene as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.

amino acids

The building blocks of proteins, which are linked together in a specific sequence as determined by the gene.

genome

In DNA and the genome, genome means the specific Unit 4.6 idea used to answer this objective: students must define the genome as the entire genetic material of an organism. 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 genome as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.

gene

In DNA and the genome, the term gene has a specific definition boundary role in Unit 4.6. Use gene when students must define the genome as the entire genetic material of an organism. 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 gene as a vague inheritance word or as a synonym for a neighbouring term; link it to Reproduction, DNA and the genome, and the exact role it plays in AQA GCSE Biology. Revision cue 1: When asking about DNA, test molecular structure, base sequence, nucleotides, or genetic information storage.