Biology : Principles of Inheritance and Variation

give a scientific term:
Functional unit of gene

Name the scientist who is associated with the following:
Mutation

Explain sex determination in bees.

Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers.

Both Haemophilia and Thalassemia are blood related disorders in humans. Write their causes and the difference between the two. Name the category of genetic disorder they both come under.

(a) Write the desirable characters a farmer looks for in his sugarcane crop. (b) How did plant breeding techniques help north Indian farmers to develop cane with desired characters ?

Explain the mechanism of ‘sex determination’ in birds. How does it differ from that of human beings?

a) Write the scientific name of the organism Thomas Hunt Morgan and his colleagues worked with for their experiments. Explain the correlation between linkage and recombination with respect to genes as studied by them.

b) How did Sturtevant explain gene mapping while working with Morgan?

Assertion: A middle aged woman is reported to have small breasts and undersized uterus.

Reason: Her genotypic analysis shows XO condition of allosomes.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F₁ plants were selfed the resulting genotypes were in ratio of 

• 1:2:1 :: Tall heterozygous: Tall homozygous: Dwarf

• 3:1:: Tall: Dwarf

•  3:1:: Dwarf: Tall

•  3:1:: Dwarf: Tall