Answer :
Using the below pedigree, the affected individual at B5 is homozygous recessive for wooly hair disorder, represented by the genotype "ww." The unaffected individuals are either homozygous dominant "WW" or heterozygous "Ww".
In a recessive disorder like wooly hair, individuals must inherit two copies of the recessive allele (one from each parent) to exhibit the phenotype. The presence of unaffected parents with affected offspring suggests that they are carriers of the recessive allele, meaning they have one copy of the allele but do not exhibit the phenotype.
The unaffected individual at B3 must be heterozygous "Ww" because they have at least one copy of the recessive allele to pass it on to their affected child at B5. The unaffected individual at B4 must also be a carrier because they have an affected parent (B5), but do not exhibit the phenotype themselves. The unaffected individual at B2 must be homozygous dominant "WW" because they do not have any copies of the recessive allele to pass on to their children.
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