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A
Arrange the following structures in order of size, starting with the smallest:
nucleus
______________
cell
gene
______________
chromosome
______________
______________
B For each of the following types of variation between people, say whether it is caused
by genetics, environment, or both.
a) Having a scar
b) Having brown eyes
c) Being tallest in the class
d) Being thinnest in the class
e) Suffering from cystic fibrosis
e) Suffering from scurvy
f) Having lung cancer
g) Skin colour
DNA
pairs gene 23 twins protein 46 mum
Dad
nucleus
chromosomes
C) Fill in the gaps using the words above:
A gene is a length of
that codes for a
Genes are found on ________________which are in the ____________ of cells. You
inherit half of your genes from your ___________________ and half from your
_____________________. Two people with identical genes are clones of each other.
They are identical _____________. Each of your body cells has 23 pairs (46 in total)
of ______________. Your sex cells have a total of ___________ chromosomes.
There are two forms of reproduction, Asexual reproduction and sexual reproduction.
In the table below write down the similarities and differences of both types of
reproduction. You should also give at least 3 examples for each.
Asexual reproduction
Sexual reproduction