Question

males are heterozygous . why?​

Answer 1

Since males have only a single copy of the X chromosome, they have only a single allele for any gene on the X chromosome. Males are said to be "hemizygous" for any X-chromosome genes, meaning that there are only half ("hemi") as many alleles as normally present for a diploid individual.

Answer 2

$\sf\pink{Hello}$

Before defining homozygous and heterozygous, we have to first think about genes. Each of your cells contains very long stretches of DNA(deoxyribonucleic acid)