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Find out the odd one in each group. a....

Find out the odd one in each group.
a. `3:1, 1:2:1,9: 3:3:1, 9:7`
b. Homozygous, Heterozygous, Hemizygous, Azygous
c. Monohybrid, Dihybrid, Polyhybrid, Back cross
d. Tall, Axial, Purple, White

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(a) `9:7`
(b) Azygous
(c ) Back cross
(d) White
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