A man is heterozygous for the two genes A and B. How many different types of gametes can he produce, and in what proportions? Write out the genotype (or allele combination) of each possible gamete.
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Humans are diploid organisms. We have two sets of 23 chromosomes (46 chromosomes in total). We also have two copies of almost every gene. Alternative forms of a gene are called alleles of the gene. An individual who carries two different alleles of a gene is said to be heterozygous for the gene. In contrast, when an individual carries two same alleles of a gene, that individual is said to be homozygous for the gene.
Gametes are sex cells produced by sexually reproducing organisms. Sperm is the male gamete, whereas egg is the female gamete. Gametes are haploid, i.e., they contain only one set of chromosomes. They also contain only one copy of each gene. During sexual reproduction, the haploid male and female gametes fuse to form a diploid zygote. The diploid zygote gives rise to the offspring.
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