Question

Q31. Study the given data and answer the questions that follow.
Parental plants cross
F1
F2
fertilized and seeds collected
Male parent always bore 330 seeds sown and Out of 44 seeds
Red flowers
observed.
sown, 33 gave red
flowers.
Female Parent always bore
white flowers
All 330 seeds gave
red flowers
Out of 44 seeds
sown 11 gave white
flowers.
(i) What is the term for this type of cross?
(ii) Which law of Mendel can be inferred from the data represented by column
F1?
(iii) Express the genotype of plants in F1 and F2 progeny. T ( (3)
OR

Answer 1

Explanation:

(i) Monohybrid cross.

(ii) It indicates that gene for red colour (R) is dominant over for white colour (r).

(iii) (a)genotype of parents – RR (male plant) and rr (female plant)

(b) genotype of F1 – Rr

(c) genotype of F2 –

RR( homozygous red),

Rr ( heterozygous red) and

rr (homozygous white)