The color of dominant is white. Genotypes of parent are white WW and black ww. The genotype of black offspring is ww.
What is genotype ?
The genotype of an organism is the chemical composition of its DNA, which gives rise to the phenotype.
A genotype present different alleles, or forms, are produced by detrimental or beneficial mutations.
For example human eye color, genotypes represent with single letters, or two letters.
During reproduction offspring will receive one allele from each parent.
For the eye color trait the letter “E” represent dominant brown color trait and "e" represent recessive blue color trait.
So the parents could be “Ee” heterozygous or “EE” homozygous or both.
If the child of the parents receive blue eye color means "ee" means parents are heterozygous as child receive one "e" allele from each parent.
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