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Genetics
key terms
Term | Definition |
---|---|
chromosomes | DNA and protein, consists of a series of genes |
genes | Part of a chromosome that controls the development of a particular characteristic |
DNA | What chromosomes are made of |
alleles | Alternative format of the same gene |
dominant allele | Allele that will show even when paired with a recessive allele |
recessive allele | Allele that is only shown when no dominant allele is present |
homozygous | The same alleles in a genetic pair |
heterozygous | Different alleles in a genetic pair |
Punnett square | The grid used to show Monohybrid inheritance |
Clone | An individual that is genetically identical to its parent |
Diploid | A cell that contains two copies (pairs) of each chromosome |
Ethics | The study of right and wrong and what people should and should not be allowed to do |
Gametes | Sex cells: sperm and eggs |
Genetic engineering | Technology involving moving genes from one organism to another, within or between species |
Genotype | Genetic identity of an organism |
Haploid | A cell containing one copy of chromosomes |
Infertility | The inability to reproduce |
Inheritance | The passing on of features through reproduction |
In Vitro Fertilisation | Technique to fertilise an egg in artificial conditions outside the female's body |
Meiosis | The type of division in a cell's nucleus that produces gametes (Sex cells) |
Mitosis | Type of division in a cell's nucleus that produces new diploid cells for growth or to replace damaged cells |
Monohybrid inheritance | Genetic inheritance of one characteristic eg eye colour |
Mutation | A spontaneous change in the genetic material of a cell |
Nucleus | Part of the cell that contains the chromosomes |
Ovum | An egg cell |
Phenotype | The physical expression of the genes an individual possesses eg brown eyes |
Transgenic | An organism whose genome has received a gene/genes from another organism |
Variation | The differences between organisms of the same species |
Carrier | An individual who carries a 'faulty' allele but does not suffer from the condition caused by the faulty allele |
Genome | All the genetic material of an organism |
Human Genome Project | International project that set out to establish the sequence of all the bases in the genes of all 23 pairs of human chromosomes |
Speciation | The process of evolution by which new species are formed |