Revise Biology Paper 2 Unit 6 Inheritance, Variation & Evolution Keywords

dna

Learn the meanings of the keywords in this topic.

allele – An alternative form of a gene.

asexual reproduction – The production of offspring from a single parent by mitosis. The offspring are clones of the parent.

chromosome – Structures that contain the DNA of an organism and are found in the nucleus.

cystic fibrosis – A disorder of cell membranes caused by a recessive allele.

DNA – A polymer that is made up of two strands that form a double helix.

dominant – An allele that is always expressed, even if only one copy is present.

fertilisation – The fusion of male and female gametes.

gamete – Sperm cell and egg cell in animals; pollen and egg cell in plants.

gene – A small section of DNA that codes for a specific protein.

genome – The entire genetic material of an organism.

genotype – The combination of alleles.

heterozygous – A genotype that has two different

alleles – one dominant and one recessive.

homozygous – A genotype that has two of the same alleles. Either two dominant alleles or two recessive alleles.

meiosis – The two-stage process of cell division that reduces the chromosome number of the daughter

embryo screening – Genetic tests carried out on an embryo to see whether it carries a faulty allele.

evolution – A change in the inherited characteristics of a population over time through a process of natural selection.

evolutionary tree – A method used to show how scientists believe organisms are related.

extinction – The permanent loss of all members of a species.

fossils – The remains of organisms from millions of years ago which are found in rocks.

genetic engineering – The process by which scientists manipulate and change the genotype of an organism.

natural selection – The process by which organisms that are better suited to an environment are more likely to survive and reproduce.

selective breeding – Humans selecting animals or plants, that have a required characteristic, for breeding.

speciation – The process by which two species evolve from a single original species by natural selection. The two populations have become so different that they can no longer interbreed to produce fertile offspring.

Download our Combined Science Inheritance Variation & Evolution Knowledge Organiser for a summary of everything you need to know for the exam.

Test knowledge with the Combined Science Foundation Assessment Pack.

Test knowledge with the Combined Science Higher Assessment Pack.

Download our Separate Science Inheritance Variation & Evolution Knowledge Organiser for a summary of everything you need to know for the exam.

Test knowledge with the Separate Science Foundation Assessment Pack.

Test knowledge with the Separate Science Higher Assessment Pack.

Subscribe to Twinkl from as little as £5 per month, giving you access to a range of resources. That’s £5 for as many resources as you can download with no limit! A bargain and a time-saver all in one! If you want to see what we offer first, sign up for a free Twinkl account here and take a look around at our free resources.

Premium

 

Leave a Reply