Principles of Inheritance and Variations — BIOLOGY STD 12 Science — Question

The species diversity of plants (22 per cent) is much less than that of animals (72 per cent). What could be the explanations to how animals achieve greater diversification ?

Suggest the aspects of reproductive health which need to be given special attention in the present scenario.

In a dihybrid cross white eyed, yellow bodied female Drosophila crossed with red eyed, brown bodied male Drosophila produced in F₂ generation, 1.3 per cent recombinants and 98.7 per cent progeny with parental type combinations. This observation of Morgan deviated from Mendelian F₂ phenotypic dihybrid ratio. Explain, giving reasons, Morgan’s observations.

What are parthenocarpic fruits? Mention one characteristic feature of such fruits.

Protein synthesis machinery revolves around RNA but in the course of evolution it was replaced by DNA. Justify.

With the help of a Punnett square, find the percentage of homozygous talls in a F₂ population involving a true breeding tall and a true breeding dwarf pea plant.

Differentiate between DNA and RNA.

What are the various health measures, which you would suggest as safeguard against infectious disease?

Expand GPP and NPP. Differentiate between the two.

If the Tropical rainforest would have been from the present 6% areas of earth to 12% areas how would the biodiversity be affected by it? Explain with reason.