MODEL PAPER 3 — BIOLOGY STD 12 Science — Question

he genotype of offspring formed from Tt x tt will be ________?

Leading strand during DNA replication is formed:

The chemical test that is used for diagnosis of typhoid is:

Saltation stands for

Two opposite forces operate in the growth and development of every population. One  of them is related to the ability to reproduce at a given rate. The force opposing to it is called:

Gray biotechnology is referred to as:

Suresh and Rajesh have defective haemoglobin due to genetic disorders. In Suresh, the problem is qualitative as he is having incorrectly functioning globin molecules while in Rajesh the problem is quantitative as he is having very few globin molecules. Identify the disorder they are suffering from.

	Suresh	Rajesh
A	Thalassemia - Autosomal Dominant blood disorder	Sickle Cell Anaemia - Autosomal linked Recessive trait
B	Sickle Cell Anaemia - Autosomal linked Dominant trait	Thalassemia - Autosomal Recessive blood disorder
C	Sickle Cell Anaemia – Autosomal linked Recessive trait	Thalassemia – Autosomal Recessive blood disorder
D	Thalassemia - Autosomal Dominant blood disorder	Sickle Cell Anaemia - Autosomal linkedDominant trait

On fertilization of egg nucleus with sperm nucleus