Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Sex chromosomes are called
allosomes (the chromosomes that
are sex chromosomes are
autosomes).

Sex chromosomes such name
because have genes that
the sex (male female) of
an . Sex chromosomes also
genes related to biological
functions.