Short Answer TypeHow many chromosomes do drones of honeybee possess? Name the type of cell division involved in the production of sperms by them.
Retroviruses convert their RNA into DNA by the method of reverse transcription, thus it is possible that the DNA of the infected host possesses DNA even when retroviruses do not have their own DNA.
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
(a) Select the homologous structures from the combinations given below :
(i) Forelimbs of whales and bats
(ii) Tuber of potato and sweet potato
(iii) Eyes of octopus and mammals
(iv) Thorns of Bougainvillea and tendrils of Cucurbita
(b) State the kind of evolution they represent.
(a) Why are the plants raised through micro-propagation termed as somaclones?
(b) Mention two advantages of this technique.
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