Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Biology

A plant having the genotype AABbCC will produce ______ kinds of gametes.

A gene pair hides the effect of another. The phenomenon is ______.

Extranuclear inheritance occurs in ______.

Extra nuclear chromosomes occur in ______.

Extranuclear inheritance is a consequence of presence of genes in ______.

In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are ______.

Two or more independent genes present on different chromosomes which determine nearly same phenotype are called ______.

Mendel’s work was rediscovered by three scientists in the year ______.

Which three scientists independently rediscovered Mendel’s work?

Chromosomal theory of inheritance was given by ______.

Experimental verification of ‘chromosomal theory of inheritance’ was done by ______.

Chromosome maps/genetic maps were first prepared by ______.

How many types of gametes would be produced if the genotype of a parent is AaBB?

Which of the following statements indicates parallelism in genes and chromosomes?

1. They occur in pairs.
2. They segregate during gamete formation.
3. They show linkage.
4. Independent pairs segregate independently.

What would be the genotype of the parents if the offspring have the phenotypes in 1:1 proportion?

A couple has two daughters. What is the probability that the third child will also be a female?

What are minisatellites?

There was a mix-up at the hospital after a fire accident in the nursery division. Which of these children belong to the parents? 

How do genes and chromosomes share similarity from the point of view of genetical studies?

Discuss in detail the contributions of Morgan and Sturvant in the area of genetics.