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

    0
    ReputationRep:
    I dont understand how you determine whether the person is DD, Dd or dd. (Any letter). After this I find it easy however before knowing the information I am usually stuck on how to work it out.
    Offline

    12
    ReputationRep:
    (Original post by FitzpatrickR)
    I dont understand how you determine whether the person is DD, Dd or dd. (Any letter). After this I find it easy however before knowing the information I am usually stuck on how to work it out.
    Ok so the question will always tell you what genotype the parents of the offspring are so all you need to know are two main definitions. The first word is homozygous, and this means that the parent has two of the same gene (e.g. DD or dd). The second word is heterozygous, and this means that the parent has two different genes (e.g. Dd). What the question will also tell you is if the parent has a dominant or a recessive gene type. This is vital because it will help you to decipher the genotype of the parent. If the parent has a heterozygous dominant gene, then their gene will be Dd, for instance, and if they has a homozygous dominant gene, then their gene will be DD.

    I hope this helps
    Online

    18
    ReputationRep:
    (Original post by NoahSwinden)
    Ok so the question will always tell you what genotype the parents of the offspring are so all you need to know are two main definitions. The first word is homozygous, and this means that the parent has two of the same gene (e.g. DD or dd). The second word is heterozygous, and this means that the parent has two different genes (e.g. Dd). What the question will also tell you is if the parent has a dominant or a recessive gene type. This is vital because it will help you to decipher the genotype of the parent. If the parent has a heterozygous dominant gene, then their gene will be Dd, for instance, and if they has a homozygous dominant gene, then their gene will be DD.

    I hope this helps
    D and d are different alleles (read: versions) of the same gene, not different genes. Be careful. If you call D and d genes in an exam, you'll probably be marked down.
    Offline

    12
    ReputationRep:
    (Original post by anosmianAcrimony)
    D and d are different alleles (read: versions) of the same gene, not different genes. Be careful. If you call D and d genes in an exam, you'll probably be marked down.
    Cheers man
    Offline

    3
    ReputationRep:
    Same i dont get it???
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.