Slides in this set
Passing Information to the Next Generation
· Humans are similar because we all have the same genes.
· What gives us our quirky differences though, is the inheritance
of different alleles to those genes.
· Gametes join together at
fertilisation to form a
How you zygote.
· Gametes always have half
the normal amount of DNA
in them, compared to
You look regular body cells.
like a rat. · This is so that when two
gametes combine, the
resulting zygote contains the
correct amount of DNA.…read more
Diploid and Haploid
·Normal body cells have the normal number of chromosomes
You might see this
46 explained elsewhere as `2n'.
We call these cells DIPLOID. It means that each body cell contains
two of each chromosome one from mum and one from dad.
·Gametes though, have half the normal number of chromosomes
And this might be explained
as just `n'. 23
We call these cells HAPLOID. There's only one copy of each
At fertilisation, a haploid sperm will fuse with a haploid egg.... which
makes a cell with the normal, diploid number of chromosomes…read more
Gametes are Formed by Meiosis
Meiosis is just a type of cell division. Unlike mitosis though, it's
outcome is insanely different.
Someone draw the outcome of As you can see by __________'s
brilliant drawing, mitosis results in
TWO, IDENTICAL DAUGHTER CELLS!
Just like the parent cell, the daughter
cells are both diploid too.
Meiosis happens in your reproductive organs.
Ovaries if your a girl...
Testicles if you're a dude...
But how..........................................................?…read more