recessive traits

[jcm1757]

Would it be possible for a person with black hair to have two children, one with red hair and the other with blonde hair?

[sapien]

Genetics of hair color is not yet fully established. However, black is dominant. So, No. There cannot be children with red/blonde hair at all.

[canalon]

Genetics of hair color is not yet fully established. However, black is dominant. So, No. There cannot be children with red/blonde hair at all.

If black is dominant, and the first person is heterozygote, then yes it is possible.

[jcm1757]

Sorry, to clarify: it isassumed that the first person is heterozygote with black hair as the dominant gene. The question is regarding the first person's recessive gene. Put another way: can one person have a recessive gene that could yield two different offspring, one with red hair and the other with blonde hair?

[sapien]

Genetics of hair color is not yet fully established. However, black is dominant. So, No. There cannot be children with red/blonde hair at all.

If black is dominant, and the first person is heterozygote, then yes it is possible.

Two is never possible. Maybe one of them can be.

[sapien]

Sorry, to clarify: it isassumed that the first person is heterozygote with black hair as the dominant gene. The question is regarding the first person's recessive gene. Put another way: can one person have a recessive gene that could yield two different offspring, one with red hair and the other with blonde hair?

Let's look at this in a much more detailed way. Say, the dominant allele for block hair follicles is B. Since you said that the first person is a heterozygote, the genotype can be written as Bb.

Now, even if the other partner is heterozygotic or double recessive homozygous, there is no chance for BOTH the children not being black. Either one of 'em will always be black... That's dominance of the allele B.

[Darby]

So if I flip a coin twice it HAS to give me one head and one tail??

[david23]

hair color is like skin color and height, they are codominant or more accurately polygenic, codominant is just a stupid term not applicable for humans

[JackBean]

Sorry, to clarify: it isassumed that the first person is heterozygote with black hair as the dominant gene. The question is regarding the first person's recessive gene. Put another way: can one person have a recessive gene that could yield two different offspring, one with red hair and the other with blonde hair?

Since it's not coded by one gene then yes. Someone here posted great link with an explanation. Try to look it up.