SOLUTION: http://imageshack.us/photo/my-images/508/page668.jpg/ I need help number 39,40 the key 39 is 500 Thank you

Question 475318: http://imageshack.us/photo/my-images/508/page668.jpg/
I need help number 39,40
the key 39 is 500
Thank you
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
39 seems to be a poorly written question. Not because it is too easy or too hard, but the simplest solution requires knowing a little biology and what a Punnett square is. Even if one does not know what a Punnett square is or is used for, he would still have to know that the offspring carries one of the alleles from each parent (at random) since the question does not explicitly say so.

We construct a Punnett square (a Punnett square shows the possible genotypes of the offspring when you cross two organisms having various genotypes):

----R----w
R--RR---Rw

w--Rw---ww

There is a 2/4 (.5) chance that the offspring's genotype will be Rw (i.e. pink flower), so out of 1000 offspring, approximately 500 will be pink.

------------------
For #40, we assume that there is a 1/2 chance of going either left or right for each peg. Hence, the only way to reach the leftmost peg is to go left each time; there are four pegs to go through, so there is a 1/16 chance of going to the leftmost slot.

If you are familiar with Pascal's triangle and combinatorics, we can say that the number of ways to go into each slot is 1-4-6-4-1 (4th row of Pascal's triangle). To show this, we can assign a series of L's (left) and R's (right), in which we have to choose four of them in some order. For example, the middle slot we would need 2 R's and 2 L's to be ordered, in which there are 4!/2!2! = 6 ways to do so.
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