Question

Short notes on: Mendel's monohybrid cross and dihybrid cross

Answer 1

Monohybrid cross is when onlly one cahrecter is considered in a cross.A pure tall (TT)plant is crossed with a pure short (tt) plant.The first generation will be tall (Tt) and it is a hybrid plant.When Tt x Tt crossed next generation will be TT,Tt,Tt,tt . 3 tall and 1 short in the second generation.
Dihybrid cross is when two charecetrs are considered at a time in a cross. Tall and round (TTRR) seeded plant is crossed with short and wrinkled (ttrr)seeded plant. In First generation (F1) all are tall and round(TtRr) .
When F1 generation plants are crossed we get F2 generation .In F2 generation 4 combinations are seen.
Tall round,tall wrinkled,short round and short wrinkled.The ration being 9:3:3:1.