NOTE-TAKING GUIDE: CHROMOSOMES AND INHERITANCE
 I Can#12: explain that sexual reproduction produces offspring that inherit half their DNA from
each parent.
 I Can#13: describe the difference between a diploid and a haploid cell.
 I Can #14: explain how genes are carried from parents to their offspring on chromosomes
Human Chromosomes
 Within the nucleus of almost every human
cell there are _____ chromosomes.
 These chromosomes come _________.
What is a diploid cell?
 We say that cells with the full set of
_____________ or 46 total chromosomes
are _______________.
Chromosomes and Life
 When a child is _______________ or has
an extra chromosome serious complications
can occur.
 Example: _____________
Chromosomes and Reproduction
 Because humans reproduce through sexual
reproduction, they
___________________ of their
_________ from ____________.
 SO, they inherit
________________________ from each
parent.
Sex Cells
 Sex cells, the __________ and the
_____________, are special cells because
each of these cells contains only
_________________.
Sex Cells
 Because each sex cell has only 23
chromosomes we say they are
____________ (think “HAlf-diPLOID”
What will the baby look like?
 Because chromosomes
carry genes, when the two
sex cells meet and the
chromosomes form pairs-the baby ends up with
______________ for
each trait.
Girl or Boy?
 SEX CHROMOSOMES: are one of the 23
pairs of chromosomes in each body cell.
 The SEX CHROMOSOMES
________________________________
________________________________
It’s a BOY
 If you are a boy, your two sex
chromosomes do not match.
 One of them is an X chromosome, and the
other is a ___________________.
It’s a GIRL
 If you are a girl, your two sex
chromosomes match.
 The two sex chromosomes are called
_________________________.