In humans there are 4 different hair type (shape) alleles: kinky, curly, wavy, and straight. They exhibit?
dominance and recessiveness is the order given. Kinky is dominant to all other alleles, straight is recessive to all other alleles. Curly is recessive to kinky but dominant to wavy. Wavy is recessive to kinky and curly and dominant to straight. The alleles for hair color are black, crown, blond and red. They exhibit dominance and recessiveness in the order given. If a man with straight black hair marries a woman who has curly brown hair what would be the phenotypic ratio of their offspring? Are you as confused as I am? lol
This is an example of multiple alleles:
K: kinky
k”: curly
k’: wavy
k: straight
and the dominance hierarchy is from the left to the right: K > k” > k’ > k
Second trait is hair color:
B: black
b”: brown (not crown)
b’: blond
b: red
and the dominance hierarchy is also from the left to the right: B > b” > b’ > b
Since you didn’t mention the heterozysity of man and woman, then there are some possibilities of the genotypes of man and woman.
Man (straight black) will have genotypes: kkBB, kkBb”, kkBb’, and kkBb
Woman (curly brown) will have genotypes: k”k”b”b”, k”k”b”b’, k”k”b”b, k”k’b”b”, k”k’b”b’, and k”kb”b
You statement: “a man with straight black hair marries a woman who has curly brown hair” will produce 4 x 6 = 24 combination (crosses). You can take any man genotype and cross with any woman genotype; but of course the result will be different when you take different genotypes.
Let’s take an example if they are homozygous for both alleles
P: k”k”b”b” >< kkBB
Gametes: (k"b") >< (kB)
F1: all k"kBb" (all curly black)
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