Q26 of 85 Page 286

A man having blood group ‘o’ (I o I o ) marries a woman with blood group ‘B’ (I B I o ). what will be the blood group of their children?

When a man having blood group A marries a woman having blood group B, two types of blood groups can be observed in their children. The possible blood group options are B and O in the ratio 1:1


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24

An animal (guinea pig) having black colour is crossed with guinea pig having the same colour. They produced 100 offsprings, of which 75 were black and 25 were white.

Find out


(i) What is the possible genotype?


(ii) Which trait is dominant and which is recessive?

 25

A cross was made between pure-breeding pea plants one with round and green seeds and the other with wrinkled and yellow seeds.

(i) Write the phenotype of F 1 progeny. Give a reason for your answer.


(ii) Write the different types of F 2 progeny obtained along with their ratio when F 1 progeny was selfed.

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How are contributions of Darwin different from that of Mendel?

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Explain the development/origin of the theory of the chemical origin of life.