Do one of your parents have to have a certain trait for you to have it?

Like eye are blue, hair is black

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  • 7 years ago

    they don't have to show it, if that is what you mean by "having" it. They need to have the info for producing that trait in their genes, but having the info doesn't mean it will be used. When you get into hair and eye color, though, there are many different genes that come into play, so a blue-eyed child can come from two black-eyed parents (but not the reverse; two blue-eyed parents cannot have a black-eyed child).

  • They would have to either be a carrier of it or it would have to be a dominant trait. There is a whole science that goes with this.

  • 7 years ago

    Yes. Or if they are a carrier of that trait i.e. Gene then you can have that same trait.

    Source(s): Gregor Mendel (father of genetics)
  • 7 years ago

    All of your genes - no exceptions - come from your mother and father. So if it's an inherited trait, the genes that caused that trait came from your parents.

    When you say "trait", you may be meaning "phenotype". This is the outward apperance of the trait, but may not be the whole story. In simple Mendellian genetics, you have dominant traits and recessive traits, which means that if you carry on dominant alleles and one recessive allele you will have the phenotype of the dominant allele. One example might be brown eyes being dominant to blue eyes. However, if both brown eye'd parents are "heterozygous" - meaning they both have a copy of the recessive allele that doesn't show - it's possible they could give their offspring the two recessive genes and no dominant genes, giving them a child with blue eyes. (Incidentally, if you're caucasian, you'll usually be born with blue eyes anyway, and only develop pigment later). So superficially, you can get a "trait" that neither of your parents have, although you did "get it from them" as a gene that doesn't show on them.

    There's also the issue that the genetics for many traits are much, much more complicated, involving many genes, and potentially many different gene variants which interact in ways that are often complex to predict. There are also many traits - including eye and hair colour - that can actually be affected in subtle ways by environmental factors, such as exposure to sunlight, diet, or even (in the case of eye colour) some form of trauma.

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  • Anonymous
    7 years ago

    No it Can go back to A cousin, Uncle or Grandparents ECT. Does Not have to be EITHER MOTHER OR FATHER.

    Source(s): Known Fact
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