Genetic x-linked genes?
Why are the terms homozygous and heterozygous not applicable to X-linked genes in males?
Answers:
Males have lone a single X chromosome and so for any gene that appears in a single copy on the X chromosome, males can have only a single allele and are thus hemizygous for most genes on the X chromosome.
The jargon homozygous and heterozygous are only used when there are multiple alleles of the gene present, typically on separate chromosomes for instance on the X chromosome (in females) and on the autosomes. Source(s): http://en.wikipedia.org/wiki/Zygosity#Hemizygous
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Answers:
Males have lone a single X chromosome and so for any gene that appears in a single copy on the X chromosome, males can have only a single allele and are thus hemizygous for most genes on the X chromosome.
The jargon homozygous and heterozygous are only used when there are multiple alleles of the gene present, typically on separate chromosomes for instance on the X chromosome (in females) and on the autosomes. Source(s): http://en.wikipedia.org/wiki/Zygosity#Hemizygous
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