Question

How can independent assortment help explain genetic diversity in humans? Hint: How many pairs of chromosomes are in a human diploid cell?

Answer 1

@Tootles143

Answer 2

I know that human diploid cells have 46 pairs of chromosomes. But I don't know how that will help

Answer 3

Give me a sec... What grade are you in?

Answer 4

10th

Answer 5

SHEESH! Okay... give me a sec...

Answer 6

Is there any choices?

Answer 7

Nope

Answer 8

I have to write out the answer..hence the explain

Answer 9

If crossing over does not occur, the offsprings will be of parental type and no recombinants occur.
Consider the example of a dihybrid test cross between a cis AaBb (i.e. AB/ab) with a double recessive aabb.

AB/ab X ab/ab

The first parent can produce 4 types of gametes, out of which AB and ab are the parental types while aB and Ab are the recombinant types.
If crossing over occurs and genes are unlinked, all the 4 gametes are produced in equal ratio (1:1:1:1) and hence, 4 types of offsprings obtained-

AB/ab
ab/ab
Ab/ab
aB/ab

However, if genes are incompletely linked, all 4 gametes and 4 offsprings are obtained, but parental types in more ratio and lesser recombinants. If recombination frequency is 30%, itwould mean

15% Ab/ab
15% aB/ab
35% AB/ab
35% ab/ab

If complete linkage occurs, only two offsprings (parental types) obtained-

AB/ab
ab/ab

Hence, independent assortment is necessary for variations. And also remember that variations are the basis of evolutions.
I got that from yahoo answers...

Answer 10

Or this:
With 23 pairs of homologous chromosomes independent assortment means alleles on different chromosomes recombine.

Answer 11

Thank you!

Answer 12

You are very welcome... I didnt put this in my own words but do so so youu wont get into trouble.. Okay?

Answer 13

Glad i was of help. :)