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Posted 2 months ago
for a gene with 7 alleles in a population: how many of those genotypes are homozygous
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Answer from Sia
Posted 2 months ago
There are 7 homozygous genotypes for a gene with 7 alleles in a population.
Understanding alleles and genotypes: An allele is a variant form of a gene, and a genotype is the set of alleles that an individual has for a particular gene. For a gene with multiple alleles, each individual will have two alleles for that gene (assuming diploidy). If both alleles are the same, the genotype is homozygous
Calculating homozygous genotypes: For a gene with n n different alleles, there are n n possible homozygous genotypes, because each allele can pair with itself to form a homozygous genotype
Applying the calculation to 7 alleles: With 7 different alleles, labeled A1,A2,A3,A4,A5,A6, A_1, A_2, A_3, A_4, A_5, A_6, and A7 A_7 , there are 7 possible homozygous combinations: A1A1,A2A2,A3A3,A4A4,A5A5,A6A6, A_1A_1, A_2A_2, A_3A_3, A_4A_4, A_5A_5, A_6A_6, and A7A7 A_7A_7
Key Concept
Homozygous genotypes for a gene with multiple alleles
For a gene with n n alleles, there are n n possible homozygous genotypes, as each allele can form a homozygous pair with itself.

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