'Rolling allele' diaporamas de présentation

Tongue rolling allele is dominant (R) Non tongue rolling allele is recessive (r )

Tongue rolling allele is dominant (R) Non tongue rolling allele is recessive (r ) Both parents are both heterozygous for the tongue rolling gene. What is the probability that: a) their firstborn child is a non tongue roller? b) the second child is also a non tongue roller?

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