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Eliza Turner——Studied at the University of Edinburgh, Lives in Edinburgh, Scotland.
When a
trait is
recessive, an
individual must
have two copies of a
recessive allele to express the
trait.
Recessive alleles are denoted by a lowercase letter (a versus A). ... If one parent is heterozygous (Ss) and the other is homozygous
recessive (ss), then half of their offspring will
have a smooth chin.
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