in a pea plant,smooth seed coats is dominant over wrinkled seed coat. what will be the expected ratio of phenotypes of the offspring in a cross between-
1.heterozygous smooth and heterozygous smooth
2.heterozygous smooth and heterozygous wrinkled
3.heterozygous smooth and homozygous smooth
(i) When a cross is made between two heterozygous smooth plants, the phenotypic ratio of offsprings will be 3:1 means three offsprings will have smooth seed coat whereas one offspring will have wrinkled seed coat.
(ii) This cross is not possible because wrinkle trait is recessive & it cannot express itself in heterozygous condition. It always need homozygous condition for its expression(ww).
(iii)When a cross is made between heterozygous smooth and homozygous smooth, all offsprings with smooth seed coat are produced.