Case Based Questions (including MCQ)

Class 10
Chapter 9 Class 10 - Heredity and Evolution

## (iv) Back cross

When we breed two plants having one contrasting characteristic each to obtain new plants, it is called monohybrid cross.

So, the correct answer is (i)Monohybrid cross

## (iv) Wp

Genotypes of F2 progeny are WW, Ww, ww

So, the correct answer is (iv) Wp

## (iv) 2:1

Ratio of white: purple flowers is 1:3

So, the correct answer is (iii) 1:3

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### Transcript

Case Based Question 1 (b) In a cross between plants with purple flowers and plants with white flowers, the offspring of F1 generation all had white flowers. When the F1 generation was self-crossed, it was observed in the F2 generation that out of 100, 75 flowers were white. Make a cross and answer the following questions: (b) Show the cross. Monohybrid Cross Given : White color flower (Dominant) Purple color flower (Receive) Parent : WW ww (White colored flowered) (Purple colored flowered) Gametes F1 generation All white colored flower F2 generation WW − 1 − Pure white colored flower Ww – 2 − Hybrid White colored flower ww − 1 − Pure purple colored flower