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Math Help - Combinations

  1. #1
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    Combinations

    1. Two mating fruit flies each have one gene for black eyes and one for red eyes. The offspring receive one eye-colour gene from the male and one from the female.
    a) Produce a tree diagram showing all the possible combinations for the offspring.
    b) How many distinct combinations can be produced?
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  2. #2
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    Quote Originally Posted by Raiden_11 View Post
    1. Two mating fruit flies each have one gene for black eyes and one for red eyes. The offspring receive one eye-colour gene from the male and one from the female.
    a) Produce a tree diagram showing all the possible combinations for the offspring.
    b) How many distinct combinations can be produced?
    Hello,

    to b):

    [B, R] is the set of genes of the male fruit fly.
    [b, r] is the set of genes of the female fruit fly.

    (The genes labeled B and b have the same effect on the offspring. I only need a method to distinguish where the genes come from)

    Then the offspring has the following sets of gene:

    [B, b]; \underbrace{[B, r]; [R, b]}_{\text{looking alike}}; [R, r];

    As you can see there are three different combinations.
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  3. #3
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    I don't understand...?

    I still don't understand........how do you figure out how many combinations there are and what about a).
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