If a widow's peak hairline is dominant and a straight hairline is recessive, then an individual heterozygous for the trait will have a hairline with widow’s peak.
What is Mendel’s law of dominance?
- When an individual is heterozygous for a trait i.e. he carrier two different types of genes for that trait, usually, one gene is dominant over the other.
- The dominant (stronger) gene expresses itself whereas the recessive (weaker) gene is not expressed.
- In case of hairline the gene of widow’s peak is dominant over the straight hairline gene. Thus, it is expressed in heterozygous condition.
- A widow’s peak is a pointed V- shaped front of the hairline.
- A person with a Widow’s peak may be homozygous dominant (WW) for the trait or heterozygous (Ww) whereas an individual with straight hairline is always homozygous recessive (ww).
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