I’ve googled it, but all the answers are telling me is that it’s been way too long since those genetics lessons in middle school
In: 13
Dominance & recessivity of alleles simply have nothing to do with their inheritance. Neither is inherently tied to selection advantage.
the recessive gene is still within the person and can be passed down to the offspring. if both parents carry the recessive gene (ie, blonde hair) and a copy of the dominant gene, (ie, brown hair) then both parents will have brown hair. however, they can both pass on the blonde hair gene to the offspring resulting in a child with blond hair.
the recessive gene would only die out if we had, say a predator that found it easier to find and eat blonde haired people. then those people would get plucked out of the gene pool while brown haired people were more likely to reproduce.
this happens a lot with goldfish. goldfish can be gold or brown. birds find it easier to see and eat the gold ones, leaving the brown ones behind. a pond full of mixed colour goldfish will eventually become all dark colours after time as the gold ones get eaten off by birds more easily.
the recessive gene is still within the person and can be passed down to the offspring. if both parents carry the recessive gene (ie, blonde hair) and a copy of the dominant gene, (ie, brown hair) then both parents will have brown hair. however, they can both pass on the blonde hair gene to the offspring resulting in a child with blond hair.
the recessive gene would only die out if we had, say a predator that found it easier to find and eat blonde haired people. then those people would get plucked out of the gene pool while brown haired people were more likely to reproduce.
this happens a lot with goldfish. goldfish can be gold or brown. birds find it easier to see and eat the gold ones, leaving the brown ones behind. a pond full of mixed colour goldfish will eventually become all dark colours after time as the gold ones get eaten off by birds more easily.
the recessive gene is still within the person and can be passed down to the offspring. if both parents carry the recessive gene (ie, blonde hair) and a copy of the dominant gene, (ie, brown hair) then both parents will have brown hair. however, they can both pass on the blonde hair gene to the offspring resulting in a child with blond hair.
the recessive gene would only die out if we had, say a predator that found it easier to find and eat blonde haired people. then those people would get plucked out of the gene pool while brown haired people were more likely to reproduce.
this happens a lot with goldfish. goldfish can be gold or brown. birds find it easier to see and eat the gold ones, leaving the brown ones behind. a pond full of mixed colour goldfish will eventually become all dark colours after time as the gold ones get eaten off by birds more easily.
Because recessive genes are still passed along to the next generation with the same frequency that dominant genes are passed along. The only way in which natural selection will select against a particular allele is if carrying it decreases the odds of that individual reproducing and passing along their genes. In other words, natural selection only cares if a recessive gene is harmful even when the dominant gene is present, and the harm has to happen before the age of reproduction.
Because recessive genes are still passed along to the next generation with the same frequency that dominant genes are passed along. The only way in which natural selection will select against a particular allele is if carrying it decreases the odds of that individual reproducing and passing along their genes. In other words, natural selection only cares if a recessive gene is harmful even when the dominant gene is present, and the harm has to happen before the age of reproduction.
Because recessive genes are still passed along to the next generation with the same frequency that dominant genes are passed along. The only way in which natural selection will select against a particular allele is if carrying it decreases the odds of that individual reproducing and passing along their genes. In other words, natural selection only cares if a recessive gene is harmful even when the dominant gene is present, and the harm has to happen before the age of reproduction.
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