When a cross is made between tall plant yellow seeds (TtYy) and tall plant with green seed (Ttyy), what proportion of Phenol type in the offspring could be expected to be: |
(i) tall and green (ii) dwarf and green |
OR |
In peas, tallness is dominant over dwarfiiess, and red colour flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated by a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers, mentioned against them. |
(i) Tall, Red = 138 |
(ii) Tall, White = 132 |
(iii) Dwarf, Rdd = 136 |
(iv) Dwarf, White = 128 |
Answer:
OR
The result shows that the four types of offsprings are in a ratio of 1 : 1 :1 :1. Such a result is observed in test-cross progeny of a dihybrid cross.
The cross can be represented as:
Tall and red (Tt Rr) \[\times \] Dwarf and White (ttrr)
Genotype of two patrents - TtRr, ttrr.
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