heterozygous - the two alleles of a gene are different, homozygous - The two alleles of a gene are the same, locus - This is the location of a gene on a chromosome, expressed - This means the allele is transcribed and translated and the protein it codes for produced, codominant - both alleles are expressed in the phenotype eg red and white produces a roan cow, recessive - two alleles are needed for them to be expressed in the phenotype eg cystic fibrosis, dominant - Only one allele is needed for it to be expressed in the phenotype eg polydactyly, haploid - The cell or organism has 1 set of chromosomes. Gametes have one set of chromosomes and some organisms have a stage in their life cycle where the cells have one set eg mosses, diploid - The organism has 2 sets of chromosomes (if reproduced sexually one set from each parent. If reproduced asexually both sets from one parent), allele - alternative version of a gene., phenotype - expression of the genetic constitution and its interaction with the environment, genotype - genetic constitution of an organism,

Inheritance Introduction

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