what is homozygous and heterozygous?

Asked by sanrachna | 30th Dec, 2009, 05:04: PM

Expert Answer:

An organism is heterozygous for a particular gene when they have dissimilar alleles at a given locus on a pair of homologous chromosomes. Heterozygous genotypes are represented by a capital letter (representing the dominant allele) and a lowercase letter (representing the recessive allele), such as 'Rr.'

An organism is homozygous for a particular gene when they possess identical alleles at a given locus on a pair of homologous chromosomes. The organism may be homozygous dominant (e.g. RR) or homozygous recessive (e.g. rr) .

Answered by  | 1st Jan, 2010, 07:46: PM

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