What is the role of genetic counselling in the eradication of geneticdisease from the society? Black-smooth hair is produced in F₂ generation resulting from a cross between pure black-rough haired guinea pig (BBRR) and pure white-smooth haired guinea pig (bbrr). Show their possible genotypes and genotypic ratios with the help of a table. [3 + 2]

Draw a scientific diagram of anaphase stage of mitosis of animal cell and label the following parts: Daughter chromosome, Continuous fibre, Centriole, Chromosomal fibre

Mention the dominant and recessive traits of two characters related with seed and one character related with flower of pea plant. Very often it is experienced that a colour-blind son is born to apparently normal parents. Show with the help of a cross how it happens.

Describe the following features occurring during anaphase stage of animal cell division: (a) Division of centromere, (b) Formation of daughter chromosome, (c) Types of spindle fibre, (d) Movement of daughter chromosome towards pole, (e) Formation of stern body.

Write three inferences deduced from the observations as mentioned in Darwin’s theory of origin of new species by natural selection with the help of a table. Explain the problem-solving ability of Chimpanzee regarding procurement of food. [3 + 2]

Explain the relationship between the decline in the number of biodiversities with that of over-exploitation with the help of two examples. Construct a mental map of problems caused by ever-increasing human population. [3 + 2]

How is micropropagation performed? Which phenomena occur during telophase stage of mitosis in an animal cell? [3 + 2]

Establish the interrelationship between gene, DNA and chromosome. What are the advantages of vegetative propagation? [3 + 2]

Show the major events of evolution with the help of a chart. What are the roles of air sacs in the flight of pigeon? [3 + 2]

Explain the following three problems related to ever-increasing human population- Over-exploitation and depletion of natural resourcese Changes in atmospheric condition and global warming Deforestation and loss of ecosystems Two major causes behind the loss of biodiversity are over-exploitation and destruction of habitat due to change in land use pattern - establish the validity of the statement with proper example. [3+2=5] Or What might be the reasons behind the disturbances in Nitrogen Cycle ? It is very much essential to publish a PBR document for each village of India — which information can be gathered from a PBR regarding biodiversity ? [3+2=5]

What information related to evolution can be obtained from the discussion on comparative structure of hearts of different vertebrate groups ? Explain the following two terms in the light of Darwinism - (a) Survival of the fittest (b) Natural selection OR Explain the evolutionary significance of homologous and analogous organs with the help of example. What are the adaptive significances of air sacs of Pigeon ? [3+2=5]

Write the name of the chemical constituents of eukaryotic chromosome with the help of a table. What happens to a cell when the cell loses control at different points in cell cycle on division ? [3+2=5] OR What events occur during Anaphase stage of mitotic cell division ?Show the steps of sexual reproduction of flowering plants with the help of word diagram. [3+2=5]