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If one parent is homozygous dominant (WW) and the other is homozygous recessive (ww), then all their offspring will be heterozygous (Ww) and possess a widow's peak.
What is phenotype?
"Phenotype" simply refers to an observable trait. "Pheno" simply means "observe" and comes from the same root as the word "phenomenon". And so it's an observable type of an organism, and it can refer to anything from a common trait, such as height or hair color, to presence or absence of a disease. Frequently, phenotypes are related and used--the term is used--to relate a difference in DNA sequence among individuals with a difference in trait, be it height or hair color, or disease, or what have you. But it's important to remember that phenotypes are equally, or even sometimes more greatly influenced by environmental effects than genetic effects. So a phenotype can be directly related to a genotype, but not necessarily. There's usually not a one-to-one correlation between a genotype and a phenotype. There are almost always environmental influences, such as what one eats, how much one exercises, how much one smokes, etc. All of those are environmental influences which will affect the phenotype as well.
If one parent is homozygous dominant (WW) and the other is homozygous recessive (ww), then all their offspring will be heterozygous (Ww) and possess a widow's peak. If both parents are heterozygous (Ww), there is a 75% chance that any one of their offspring will have a widow's peak.
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