Explain why haemophilia is found more in males than in females with the help of a cross. How can genetic counselling be helpful in making the world free of genetic diseases.

According to Mendel what do you mean by dominant and recessive character in monohybrid cross? Evaluate how genetic counselling can help a man to take right decision before and after marriage.

Changes in land use policy have endangered reptiles and amphibians. Identify those species with the help by interviewing and environment list. Explain how biosphere reserve can make conservation efforts successful.

(a) Why is haemophilia generally observed in human males? Explain the conditions under which a human female can be haemophilic. (b) A pregnant human female was advised to undergo MTP. It was diagnosed by her doctor that the foetus she is carrying has developed from a zygote formed by an XX-egg fertilized by Y-carrying sperm. Why was she advised to undergo MTP?

Explain the benefits of tiger in a dense forest for variation. How can you assume about dominant recessive homozygous-heterozygous and pure hybrid organism from a genetic cross.

(i) Why are grasshopper and Drosophila said to show male heterogamety ? Explain. (ii) Explain female heterogamety with the help of an example.

A male rabbit of genotype AABBDDEE is crossed with a female rabbit of genotype aabbddee to produce F_(1) hybrid offspring. How many genetically different gametes can be produced by this F_(1) hybrid