24) Mendel crossed purebred wrinkled, green-seeded plants with purebred round, y

Question

24) Mendel crossed purebred wrinkled, green-seeded plants with purebred round, yellow-seeded plants. The F1 progeny were self-crossed. Which of the following numbers are most likely to result from this cross.

a) 22 round, yellow; 26 round, green; 28 wrinkled, yellow, 24 wrinkled green

b) 91 round, yellow; 32 round, green; 30 wrinkled, yellow, 8 wrinkled green

c) 64 round, yellow; 26 round, green; 27 wrinkled, yellow, 27 wrinkled green

d) 11 round, yellow; 26 round, green; 27 wrinkled, yellow, 87 wrinkled green

25) What is the value closest to the chi-square value of the product of the correct cross from problem 24 preceding

a) 2/5

b) 4/5

c) 7/25

d) 49/90

Explanation / Answer

(24):- As per the Mendel's lawsof Independent assortment:-

The self cross between RRyy and rrYY give rise the result in the ratio of 9:3:3:1.

thus out of these four combinations, the right answer is (b), because only these combination follows the ratio of Independent assortment.

(25) :- Since the value of chi square can be calculated as :-

= (observed value - expected value)^2 / expected value of the crosses.

By putting the values of observed and expected values of the crosses, we get the ratio 0.533, which is close to the 0.544 i.e. 49/90.

Thus the right answer is 49/90.

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