Question

what is the genotype of individual ii-2? heterozygous homozygous dominant homozygous recessive

Explanation:

Step1: Analyze Pedigree Symbols

In pedigree charts, a filled circle (female) or square (male) represents an affected individual, and open symbols represent unaffected. Here, the first generation has an affected female (filled circle) and unaffected male (open square). The second generation (II) has II - 2 as an open circle (unaffected female), and her offspring (third generation) include an affected male (filled square).

Step2: Determine Inheritance Pattern

Since II - 2 (unaffected) and her partner (II - 1, unaffected square) have an affected child (recessive trait shows when both alleles are recessive), the trait is recessive. For II - 2 to be unaffected but have an affected child, she must carry one recessive allele (from the affected parent in generation I) and one dominant allele (to be unaffected). So her genotype is heterozygous (one dominant, one recessive allele).

Answer:

Heterozygous