This key facts covers Inheritance of Sex within Sex Determination for GCSE Biology. Sex chromosomes and sex determination mechanisms It is section 2 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 11
Practice
26 questions
Recall
20 flashcards
Inheritance of Sex
Mother (XX): Always passes on an X chromosome
Father (XY): Can pass on X or Y (50% chance of each)
| X | Y | |
| X | XX (female) | XY (male) |
| X | XX (female) | XY (male) |
Probability: 50% chance of boy, 50% chance of girl