In humans, males are XY and females are XX. Why are sex-linked characteristics more common in males than females?

The recessive allele is always expressed in males, whereas females need two recessive alleles (homozygous recessive). Females could have dominant and recessive alleles, which would mean they are carriers, but would not express the recessive allele.

CC
Answered by Caitlin C. Biology tutor

2834 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

What is the equation for photosynthesis?


Describe and explain how the mammalian respiratory system is adapted for efficient gas exchange.


What is the role of the kidneys in osmoregulation?


What are oncogenes and how do they relate to tumor formation?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning