In pea plant, smooth seed coat is dominant over wrinkled seed coat. What will be expected ratio of phenotypes of the offspring in a cross between (i) Heterozygous smooth × Heterozygous smooth (ii) Heterozygous smooth × Homozygous wrinkled (iii) Heterozygous smooth × Homozygous smooth.
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¡)1 homozygous smooth,2 heterozygous smooth,1 homozygous wrinkled
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1. When we make a cross between two heterozygous smooth plants we observe a ratio of 3:1, that is the chances of getting smooth offspring are three whereas the chances of getting wrinkled offspring is one
2. A cross between heterozygous smooth and homozygous wrinkled is not possible as wrinkle trait is recessive and it cannot express itself. Homozygous conditions are always necessary for it to express itself.
3. Since the cross is made between heterozygous smooth and homozygous smooth, all offspring are smooth.
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