Asexual reproduction is when only one parent is needed and there is no fusion of gametes., , Offspring produced by asexual reproduction are called clones., , Sexual reproduction involves the fusion of male and female gametes, , The genetic material in he nucleus of a cell is made up of a chemical called DNA., , Long threads of DNA, which are made up of many genes are called chromosomes., , A gene is a section of DNA on a chromosome that codes for a certain characteristic., , Alleles are different versions of the same gene., , A dominant allele is always expressed even if only one copy is present., , A recessive allele is only expressed if an individual has two copies and does not have the dominant allele of that gene., , Homozygous alleles are both identical for the same characteristic, for example AA or aa., , Heterozygous alleles are both different for the same characteristic, for example Aa., .

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