Give a brief answer for each of the following :(i) What is heterosis?�

1.	Give a brief answer for each of the following :(i) What is heterosis? (ii) Why is non-cyclic photo phosphorylation considered as a non-cyclic pathway? (iii) Define test cross. (iv) What are introns?
Answer» (i) Heterosis is the increased hybrid vigour displayed by the offspring from a cross between genetically different parents. (ii) Non-cyclic photo phosphorylation is considered as non-cyclic pathway because electrons expelled by the excited photo centre does not return to it. It produces both ATP and NADPH. (iii) Test cross is a special type of back cross made between the individual with a dominant trait and its recessive parent in order to know whether the homozygous or heterozygous for the trait. (iv) Introns are the segment of DNA that does not code for the gene product. They are transcribed in primary transcript but are subsequently removed from the transcript before translation.

Give a brief answer for each of the following :(i) What is heterosis? (ii) Why is non-cyclic photo phosphorylation considered as a non-cyclic pathway? (iii) Define test cross. (iv) What are introns?

Answer»

(i) Heterosis is the increased hybrid vigour displayed by the offspring from a cross between genetically different parents.

(ii) Non-cyclic photo phosphorylation is considered as non-cyclic pathway because electrons expelled by the excited photo centre does not return to it. It produces both ATP and NADPH.

(iii) Test cross is a special type of back cross made between the individual with a dominant trait and its recessive parent in order to know whether the homozygous or heterozygous for the trait.

(iv) Introns are the segment of DNA that does not code for the gene product. They are transcribed in primary transcript but are subsequently removed from the transcript before translation.

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