How can two brown-eyed parents produce a blue-eyed offspring?

  • Google+ icon
  • LinkedIn icon

If both parents are heterozygous (xX) and the blue allele (x) is recessive to the dominant brown allele (X), the offpring has a 1/4 chance of getting homozygous recessive alleles (xx).

If one or more of the parents are homozygous dominant (XX), the genes could be mutated (insertion, deletion, substitution) before it is passed on to the offspring, preventing it from from being expressed, producing a recessive phenotype in the offspring and potentially a new allele of the gene.

Jeffrey D. GCSE Biology tutor, A Level Biology tutor, 13 plus  Biolog...

About the author

is an online A Level Biology tutor with MyTutor studying at Imperial College London University

Still stuck? Get one-to-one help from a personally interviewed subject specialist.

95% of our customers rate us

Browse tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss