Genetic Variation
can you spot:
2 non-identical bros
1 bro without a bro
2 bears
2 bare bottoms (identical sisters)
A bit of variation here then, from lots to not much(- or is it none?), where does it come from?
Here's a thought.... if those 2 identical sisters married 2 identical brothers would their kids be identical?
2 non-identical bros
1 bro without a bro
2 bears
2 bare bottoms (identical sisters)
A bit of variation here then, from lots to not much(- or is it none?), where does it come from?
Here's a thought.... if those 2 identical sisters married 2 identical brothers would their kids be identical?
http://weloveteaching.com/0bio105/lectures/genetics/genetic.html
Independent assortment
If we use:
B brown eyes
b blue eyes
D dark hair
d red hair
can we figure out the gamete genotypes
B brown eyes
b blue eyes
D dark hair
d red hair
can we figure out the gamete genotypes
With TWO pairs of chromosomes
2 pairs gives us 4 gametes possible
With THREE pairs of chromosomes
3 pairs gives us 8 gametes possible
There are 23 pairs of shoes at my door!!!
How many ways could I make a pile if I chose ONE from each pair?
ans: 2x2x2x2x2x2.... 23 times, about 8 million!!!
that's some variation there!
but wait there is more to eggs and sperm than that
ans: 2x2x2x2x2x2.... 23 times, about 8 million!!!
that's some variation there!
but wait there is more to eggs and sperm than that
Independent assortment happens because homologous pairs of chromosomes segregate RANDOMLY during meiosis,
Segregation: The separation of paired alleles or homologous chromosomes, during meiosis, so that the members of each pair appear in different gametes.
Segregation: The separation of paired alleles or homologous chromosomes, during meiosis, so that the members of each pair appear in different gametes.
Meiosis clips
Workbook pp 142 - 150