To determine the missing allele combinations, let's start by analyzing the available information.
From the information provided:
- Father’s Mother (brown hair) has the genotype Bb. This means she has one allele for brown hair (B) and one for blonde hair (b).
- Mother’s Mother (brown hair) has the genotype BB, meaning she has two alleles for brown hair.
- Mother (brown hair) has the genotype Bb, indicating she has one allele for brown hair and one for blonde hair.
- Child (blond hair) has the genotype bb, meaning they have two alleles for blonde hair.
Next, we can infer the likely genotypes for:
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Father’s Father: Since the father has at least one brown hair allele (because of the child’s mother's Bb and the child's bb genotype), it's likely that the Father’s Father must also have at least one brown allele. This means that the Father’s Father can either be BB (homozygous) or Bb (heterozygous).
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Mother’s Father: This individual's genotype is not provided, but given that the mother's mother has BB, it suggests that the father's allele is also likely to be BB or Bb since the blonde hair allele (b) does not appear in either the mother or her mother.
Summarizing the combinations we are missing based on typical dominant-recessive inheritance:
- Father's Father: Could be BB or Bb, but he has brown hair.
- Mother's Father: Could be either BB or Bb as well.
To summarize:
- Father's Mother: Bb
- Mother's Mother: BB
- Mother: Bb
- Father's Father: BB or Bb
- Mother's Father: BB or Bb
- Child: bb
Determine and match the individuals accordingly based on the information above.
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