In genetics, what does co-dominance mean?

Dominant alleles need the presence of only one copy to achieve expression. Recessive alleles need two copies to achieve expression. In Co-Dominance, both alleles are expressed at the same time. 

The flower below has co-dominant alleles for red and white colouration.

Michael T. Mentoring -Medical School Preparation- tutor, Mentoring -P...

2 years ago

Answered by Michael, an A Level Biology tutor with MyTutor

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


Elizabeth T. A Level Biology tutor, GCSE Biology tutor, GCSE History ...
View profile
£20 /hr

Elizabeth T.

Degree: Biomedical Science (Bachelors) - Newcastle University

Subjects offered: Biology, Chemistry


“A Little Bit About Lizzie: I am a Biomedical Science student studying at Newcastle University. I recieved grade A's in Biology, Chemistry and Maths at A-level, and have always had a real passion for science! I am patient and have a v...”

PremiumLouise R. A Level Biology tutor, A Level Chemistry tutor, A Level Mat...
View profile
£24 /hr

Louise R.

Degree: Chemistry (Masters) - Edinburgh University

Subjects offered: Biology, Maths+ 1 more


“Hi my name is Louise Roberts and I am a 1st year Chemistry student at the University of Edinburgh.  I am very much looking forward to meeting some of you and hopefully helping you with your studies inBiology, Maths and of course, Chem...”

Jed M. GCSE Biology tutor, A Level Biology tutor, GCSE Chemistry tuto...
View profile
£20 /hr

Jed M.

Degree: Natural Sciences (Bachelors) - Exeter University

Subjects offered: Biology, Physics+ 2 more


“Hi! I'm a second year Natural Science student at the University of Exeter. I love all things science, and enjoy sharing what I know about it with others. For my GCSEs and A Levels, I found worked examples and practice questions are ke...”

MyTutor guarantee

About the author

PremiumMichael T. Mentoring -Medical School Preparation- tutor, Mentoring -P...
View profile

Michael T.

Currently unavailable: no new students

Degree: Medicine (Bachelors) - Oxford, St Catherine's College University

Subjects offered: Biology, -Personal Statements-

-Personal Statements-
-Medical School Preparation-

“Oxford Medicine Student: 3+ years of University Application experience; 2+ years of Exam prep experience.”

You may also like...

Other A Level Biology questions

What are the differences between facilitated diffusion and active transport?

What is respiration and why is it needed?

What are the main differences between Mitosis and Meiosis?

Explain how an impulse is transmitted between nerve cells.

View A Level Biology tutors


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