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recessive traits

Genetics as it applies to evolution, molecular biology, and medical aspects.

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recessive traits

Postby jcm1757 » Sun Jun 24, 2012 10:17 pm

Would it be possible for a person with black hair to have two children, one with red hair and the other with blonde hair?
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Postby sapien » Wed Jun 27, 2012 7:38 pm

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.
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Re:

Postby canalon » Thu Jun 28, 2012 2:47 am

sapien wrote: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.
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Re: recessive traits

Postby jcm1757 » Thu Jun 28, 2012 4:46 am

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?
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Re: Re:

Postby sapien » Thu Jun 28, 2012 5:36 am

canalon wrote:
sapien wrote: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.
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Re: recessive traits

Postby sapien » Thu Jun 28, 2012 5:38 am

jcm1757 wrote: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.
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Postby Darby » Thu Jun 28, 2012 5:14 pm

So if I flip a coin twice it HAS to give me one head and one tail??
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Postby david23 » Sat Jun 30, 2012 2:59 am

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
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Re: recessive traits

Postby JackBean » Tue Jul 03, 2012 9:09 pm

jcm1757 wrote: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.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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