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13 May, 09:58

A Pea plant that is homozygous for inflated pods are heterozygous for round seeds is crossed with a plant that is heterozygous for inflated pods and a homozygous for wrinkled seeds this across would produce a 4:12 or 1:3 phenotypic ratio true or false

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  1. 13 May, 13:57
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    The answer is False!

    P - dominant allele for inflated pods

    p - recessive allele for inflated pods

    PP - homozygote with inflated pods

    Pp - heterozygote with inflated pods

    pp - homozygote with inflated pods

    S - dominant allele for round seeds

    s - recessive allele for wrinkled seeds

    SS - homozygote with round seeds

    Ss - heterozygote with round seeds

    ss - homozygote with wrinkled seeds

    1. A Pea plant that is homozygous for inflated pods are heterozygous for round seeds: PPSs

    2. A plant that is heterozygous for inflated pods and a homozygous for wrinkled seeds: Ppss

    Let's look at their genotypes separately, and cross them that way:

    Parents: PP x Pp

    Offspring: PP PP Pp Pp

    All of the offspring will have the same phenotype (100% = 1). So, this trait does not affect phenotypic ratio

    Parents: Ss x ss

    Offspring: Ss Ss ss ss

    Half of the offspring will have wrinkled seeds and half of them will have round seeds: 50% : 50% = 1 : 1

    So, the phenotypic ratio is not 1 : 3
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