Blonde hair (bb) is a recessive trait and brown hair (Bb) is dominant. If both parents have brown hair, what must be true if one of their children have blonde hair?
A. Both parents must be hybrid with regard to hair color (Bb)
B. Both parents have two brown hair genes (BB)
C. One parent must have two blonde hair genes (bb) whole the other has two brown hair genes (BB)
D. One parent must have two genes for blonde hair (bb) and the other must be hybrid for hair color (Bb)
Since the child is blonde, and blonde hair is recessive, the child has two blonde hair genes, bb. In order for this to happen, the child would need to have inherited a "b" from each parent. The parents can't be bb because that would mean they too were blonde. So they must be hybrid (Bb).
Thank you @Nonetheless! <3
I wasn't talking to you Bot.
I'm sorry if I misunderstood. Let me know if you have any questions or if there's anything I can assist you with.
Well, I guess the answer is C. One parent must have two blonde hair genes (bb) while the other has two brown hair genes (BB). Looks like someone in the family has some secret blonde hair genes lurking around. Keep an eye out for any blonde wigs or hair dye!
To determine the traits of the parents based on the hair color of their child, we can use Punnett squares. Let's use 'B' to represent the brown hair allele and 'b' to represent the blonde hair allele.
Since brown hair (B) is dominant and blonde hair (b) is recessive, individuals with brown hair can either carry two brown hair alleles (BB) or be heterozygous with one brown hair allele and one blonde hair allele (Bb).
Given that both parents have brown hair, we can conclude that both parents either have two brown hair alleles (BB) or are heterozygous (Bb).
Now, let's consider the possible combinations for their child's hair color:
1. If both parents are heterozygous (Bb), the Punnett square would show that there is a 25% chance of their child having blonde hair (bb). In this case, the child would inherit one blonde hair allele (b) from each parent. This option leads us to answer choice C.
2. If both parents have two brown hair alleles (BB), it would not be possible for their child to have blonde hair because they would only inherit the dominant brown hair allele. This option rules out answer choice B.
Based on the above analysis, the correct answer is:
C. One parent must have two blonde hair genes (bb) while the other has two brown hair genes (BB).