A2 OCR Biology- F215-Control, Genomes and the Environment: glossary.

A2 OCR Biology.

F215: Control, Genomes and the Environment

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GLOSSARY FOR UNIT 4
Key word Definition
Abiotic factors Non-living factors.
Ecosystem
Abiotic stress pH levels, light intensity and minerals.
Plant responses
Abscission Where the leaf drops.
Plant responses
Allele It is an alternative version of a gene. It is still at the same
Meiosis and variation locus on the…

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· The genome BB has come from wild emmer wheat.

Carnivores Animals that eat other animals.
Ecosystem
Carrying capacity Maximum population size that can be maintained over a
Biotechnology and gene technologies. time.
Population and sustainability
Central nervous system This includes the brain and spinal cord as part of the…

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Cellular control
Decomposers Living organisms that feed on waste materials or dead
Ecosystem organisms.
Detritus Organic matter in dead organisms and waste mateirals.
Ecosystem
Degenerate code There is more codes than they are amino acids.
Cellular control
Dihybrid Two genes are "passed" on at a time.
Meiosis and variation
Diploid…

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Ecosystem
Habituation Something that causes an escape reflex if repeated again
Animal behaviour then the escape reflex stops.
Haploid A nucleus with all its chromosomes unpaired, an example in
Meiosis and variation humans would be 23 chromosomes.

Hardy-Weinberg principle Calculates the allele frequencies in population.
Meiosis and variation
Herbivores Animals…

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Modern dairy cow They undergo a range of steps through artificial selection:
Variation · Each cow's milk yield is measured and recorded.
· The descendants of the bulls are tested to find out
which bulls have produced daughters with high milk
yields.
· Only a few good-quality bulls are needed…

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4. When the chromosomes condense, they pair up
(synapsis).
5. Crossing over occurs.


Prophase II 1. Centrioles have replicated.
Meiosis and variation

Recessive Both alleles are needed to express the feature.
Meiosis and variation
Regulators This is the structural gene (operon) for the operator.
Cellular control
Reproductive mechanism This occurs…

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Telophase II 1. Chromosomes unwind and nuclear membrane
Meiosis and variation reforms.


Temporal mechanism This is where organisms live in the same area but are not
Variation active at the same time, e.g. hibernation.
Transcription This is copying part of the genetic code onto a length of RNA.
Cellular control…

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