genetics
- Created by: GraceYoung
- Created on: 29-08-18 16:24
View mindmap
- genetics
- genetic terms
- inside a cell
- when gametes fuse at fertilisation they form a diploid zygote
- each zygote inherits different alleles of their genes from their parents
- there are 2 copies of each chromosome in body cells
- each copy has the same genes in the same order along its length
- a gene is a short piece of DNA at a particular point on a chromosome
- when gametes fuse at fertilisation they form a diploid zygote
- alleles
- chromosomes of the same pair have the same genes in the same order
- the same allele on each chromosome means the person in homozygous
- different alleles of the same gene means the person is heterozygous
- genetic definitions
- genotypes show the alleles in the individual
- the effect of the recessive allele will only show when two copies are present in the genotype
- phenotype means the characteristics that are produced including what the individual looks like
- the effect of the dominant allele will show when at least one copy is present in the genotype
- inside a cell
- genetic inheritance
- Some characteristics are controlled by a single gene, such as fur in animals and red-green colour blindness in humans.
- One chromosome of each pair is inherited from the mother and the other one is inherited from the father.
- genetic variations and mutations
- causes of variation that influence phenotype include genetic variation and environmental variation
- genetic variation happens through mutation.
- a mutation or genetic variant is created if the sequence of bases in the genes is changed
- a mutation in the gene's coding DNA can affect the phenotype of an organism
- genetic terms
Comments
Report