Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

Why are non-albuminous seeds so called?

At what stage does the meiosis occur in an organism exhibiting haploidic life cycle and mention the fate of the products thus produced.

Khorana and his colleagues synthesized an RNA molecule with repeating sequence of AG nitrogenous bases (AG AG AG AG AG AG). It produced a tetrapeptide with alternating sequence of valine and tyrosine. It proves that codon for valine and tyrosine are?

What is adaptive radiation?

Constructed plasmids.

Name the Following : The aquatic fern commonly used in paddy field as a biofertilizer.

Give examples of restriction endo¬nucleases that cut DNA at non- pallindromic sequences.

Which one of the following statements is true of Cucurbits?

1. It is monoecious producing both staminate and pistillate flowers in the same plant.
2. It is monoecious producing staminate and pistillate flowers in two different plants.
3. It is dioecious producing staminate flowers in one plant and pistillate flowers in another.

A new breed of sheep developed from crossing of Bikaneri ewe and Marino rams in Punjab.

Define: Organic evolution