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    in humans there is a gene that controls formation of muscles in the tongue, allowing people with those muscles to roll their tongue and those without them to be unable to do so. this gene is expressed as a dominant gene. using a punnet diagram as part of the answer, discuss the children of a homozygous non-tongue roller (resessive) and a heterozygous roller, the proportion of children with each trait that thay would have? please help!!!
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    50% heterozygous (roller)
    50% homozygous recessive (non roller)
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    Any chance of a little more detail please?! With the punnet diagram and also how you would get that answer?! In need of help!!
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    (Original post by ckacorri)
    Any chance of a little more detail please?! With the punnet diagram and also how you would get that answer?! In need of help!!
    (Original post by ckacorri)
    Any chance of a little more detail please?! With the punnet diagram and also how you would get that answer?! In need of help!!
    Attachment 697242
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    The blue being the tongue rollers as the dominant allele is present

    The red being the non tongue roller as no dominant allele is present
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    (Original post by Anonymous)
    The blue being the tongue rollers as the dominant allele is present

    The red being the non tongue roller as no dominant allele is present
    hey there thankyou for your reply, but unable to view attachment??!!
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    (Original post by ckacorri)
    hey there thankyou for your reply, but unable to view attachment??!!
    Ok type this in google-homozygous recessive cross with heterozygous.(you should find a cross with Ff Ff ff ff or something similar to this)
    Two of the offspring are tongue rollers as the dominant allele is present (when dominant allele present it is always expressed)
    The other two are non tongue rollers so two recessive alleles are present (absence of dominant allele means recessive phenotype is expressed)

    Is this for GCSE biology? You'll get a hang of it with practice I used to find it confusing at one point but it's very simple just make sure you understand all the key words and it's easy marks in the exam!
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    Thank-you for your reply, it is the last part of an a level, I'm confusing myself, and over thinking!!
 
 
 
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