Number and types of chromosomes

1.

Number and types of chromosomes

2.

Lesson objectives
To compare the amount of chromosomes
in different organisms.
To know the amount of autosomes and
gonosomes in cells.

3.

Human cells contain 46 chromosomes
or 23 pairs of chromosomes

4.

Half of these chromosomes come from
father and half come from mother

5.

HAPLOID CELL
This cells have one set of
chromosomes (n=23).
EX: egg cell and sperm.

6.

DIPLOID CELL
DIPLOID cells have two sets of
chromosomes.
All the cells of our body except sperm
and egg are diploid (2n=46)

7.

There two types of chromosomes:
Autosomes are 22 pairs (44) of all 23
pairs of human chromosomes that
carry most of information about
organism.
Sex chromosomes or gonosomes
are one pair of chromosomes that
determine if you are boy or girl.

8.

9.

Females have XX chromosomes
Males have XY

10.

Let’s do activity on p.113

11.

Homework
Read p. 112-113
Answer to literacy questions on p 113
New words