Topic 7 - Genetics, populations, evolution and ecosystems

Question 1

Define the following terms: allele, genotype, homozygous, heterozygous, dominant, recessive and phenotypes

Answer 1

Allele - different version of a gene
Genotype - combination of alleles
Homozygous - when both the alleles are the same
Heterozygous - where the two alleles are different
Dominant always expressed over the recessive
Phenotype - characteristics you receive from your genotype

Question 2

What are genes and alleles?

Answer 2

Genes are sections of DNA which codes for a particular polypeptide needed to produce a characteristic. They exist in two or more forms called alleles. Only one allele of a gene can occur at the locus of any one chromosome.