Question

(ii) Study carefully the given flow chart depicting cross between plant
having pink coloured flowers and white coloured flowers.
Male plant with pink coloured Female plant with white
X Х
flowers
coloured flowers
F generation A
Self pollination
F, generation B
Which of the following is/are correct statement/s about 'A' and 'B?
(a) 'A' depicts all plants with pink coloured flowers.
(b) 'B' depicts all plants with pink coloured flowers.
(c) 'A' depicts plants with pink coloured flowers and white coloured
flowers are in the ratio of 3: 1.
(d) 'B' depicts plants with pink coloured flowers and white coloured
flowers are in the ratio of 3:1
*PLEASE TELL ME THE ANSWER*​

Answer 1

Answer:

(a) and (d) are correct statements.

Answer 2

Answer:

The correct options will be -

(a) 'A' depicts all plants with pink coloured flowers.

(d) 'B' depicts plants with pink coloured flowers and white coloured flowers are in the ratio of 3:1.

Explanation:

This is a problem of genetics.

Suppose the Plants have homozygous locus and plants  having pink coloured flowers have the genotype PP (P denotes the pink colour) and plants with white flowers have the genotype pp (p denotes the white colour) and P or the pink colour is dominant over p or the white coloured plants.

Now male plants with pink flowers or PP genotype is crossed with female plants with pp genotypes.

Parents ----   PP  (male)  ×      pp  (female)

Gametes------- P                       p

F₁ generation----   Pp (pink flowers) [self pollinated]

Gametes----------   P     &    p

F₂ generation-------- PP (pink) , Pp (Pink) , Pp (Pink) and pp (white)

From the F₁ generation we can see all the plants are heterozygous and pink flowered.

From the F₂ generation we can see the phenotypic ratio of Pink flowers : white flowers = 3: 1 [ as there are 3 pink flowering plants and 1 white flowering plant]

Now according to the question, F₁ generation is symbolised by A and F₂ generation is symbolised by B.

So, A depicts all the plants with pink colours and B depicts plants with pink coloured flowers and white coloured flowers are in the ratio of 3:1.

So option (a) and option (d) are correct According to the question.

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