Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    14
    ReputationRep:
    Hi guys!

    I need a little help finding the expectedvalues on my table. This is about genetics, by the way.

    I know the expected ratio is 1:2:1 and the observed values are as follows:

    Red - 62
    Pink - 131
    White - 67

    And the total is 260, of course. I've been searching it everywhere and I must be really stupid because my classmate said it was easy to find :/ and I can't ask my teacher because we're supposed to give it to him as part of our coursework.

    Thanks TSR!
    Offline

    12
    ReputationRep:
    So you do like a mean for the expected values but to fit your ratio.
    It would be 260/4= 65 Then you multiply by your ratio so would be 65:130:65
    Offline

    13
    ReputationRep:
    (Original post by katyness)
    Hi guys!

    I need a little help finding the expectedvalues on my table. This is about genetics, by the way.

    I know the expected ratio is 1:2:1 and the observed values are as follows:

    Red - 62
    Pink - 131
    White - 67

    And the total is 260, of course. I've been searching it everywhere and I must be really stupid because my classmate said it was easy to find :/ and I can't ask my teacher because we're supposed to give it to him as part of our coursework.

    Thanks TSR!
    I'm assuming that ratio was 1 : 2 : 1?

    You have 260 in total.

    1 + 2 + 1 = 4 .... your ratio is split into 4 bits.
    So divide it by 4 to get 65, to get the value of each 'bit'

    To get your expected values:

    A ratio of 1 means 1 x 65 = 65
    A ratio of 2 means 2 x 65 = 130

    Therefore if you have 260 seeds in the ration 1 : 2 : 1, then you expect to get 65 : 130 : 65 seeds.

    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by Consilio Et Animis)
    So you do like a mean for the expected values but to fit your ratio.
    It would be 260/4= 65 Then you multiply by your ratio so would be 65:130:65

    (Original post by CityOfMyHeart)
    I'm assuming that ratio was 1 : 2 : 1?

    You have 260 in total.

    1 + 2 + 1 = 4 .... your ratio is split into 4 bits.
    So divide it by 4 to get 65, to get the value of each 'bit'

    To get your expected values:

    A ratio of 1 means 1 x 65 = 65
    A ratio of 2 means 2 x 65 = 130

    Therefore if you have 260 seeds in the ration 1 : 2 : 1, then you expect to get 65 : 130 : 65 seeds.

    Thank you very much
    Offline

    13
    ReputationRep:
    (Original post by katyness)
    Thank you very much
    No problemo
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.