BY5.4 Genes and Alleles

Genes and Alleles

1866 Gregor Mendell

genes:

• basic unit of inheritance
• carried on and transmitted by chromosomes
• consist of DNA

main characteristics of genes:

• separate and combine
• mutate
• code

Alleles:

• alternative forms of a gene occupying a simiar gene-position (locus) on a homologous chromosome
• alleles that make up the gene exist in 2 forms

3 different allele combinations for any one locus:

• heterozygous:
  • dominant and recessive allele present
  • each…