Genes are the basic unit of inheritance by which characteristics are passed on from one generation to another
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Color Blind ness Traits that are determined by alleles carried on the X chromosome
There are two versions of the hair type gene, curly (
) and straight (
). Hair type is an example of incomplete dominance.
If you have one
of each version of the gene
, you get a mix of the two or wavy hair. So for hair type,
gives straight hair.
Traits that are determined by alleles carried on the
are referred to as
. X-linked alleles require a specific notation: X
(recessive allele) or X
Females will have two X-linked alleles (because females are XX), whereas males will only have one X-linked allele (because males are XY).
One example of an X-linked trait is red-green colorblindness.
Females that are X
normal color vision
Females that have X
Males that are X
have normal color vision
Y males are colorblind.
) -recessive allele that causes colorblindness
)- the normal dominant allele.
Most people place their left thumb on top of their right and this happens to be the dominant phenotype.
Right thumb on top of left thumb is recessive.
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