Using mendelian genetics, explain how two brown eyed parents can have a blue eyed child. Which of the alleles is dominant? You may use a graph to support your explanation (Tip: Assume a simple dominance and inheritance )

Given that the brown eyed parents are able to produce blue eyed offspring, it is safe to assume that they are both heterozygots for eye colour and that the brown allele is dominant (A) over the blue allele (a). With this knowlege, we can put together a Punnet square that demonstrates how two heterozygous parents with the brown eye phenotype have a 1 in 4 probability of having a blue eyed child. 

Answered by Jeremy T. Biology tutor

2398 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

How does atherosclerosis form?


A bacterial infection that cannot be treated with one sort of penicillin can be treated with a different sort. Use your knowledge of enzyme action to explain why the different sort of penicillin is effective in treating the infection.


How is a growth curve of microorganisms shaped? What happens during the different phases?


Gene mutations can arise during DNA replication. Explain why different types of gene mutation may have different effects on the encoded polypeptide.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences