HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Important Questions for Biology

If only one 'X' chromosome is found in a female person, which of the following symptoms she will show?

1. epicanthal skin fold
2. webbing of neck
3. small testis and absence of spermatogenesis
4. presence of simian crease on the palm

Which of the following is NOT an example of connecting link?

1. Archaeopteryx
2. fchthyostegia
3. Seymouria
4. Biston betularia

What is gene pool?

Give any 'two' names of X-linked diseases

What will be the phenotype of progeny, if a carrier haemophilic female marries a normal male?

Write a note on multiple alleles considering examples of human blood groups.

Define the term ‘genome’.

What is criss-cross inheritance?

Sketch and label the structure of chromosome.

Explain the significance of a test cross.

Distinguish between X andY chromosomes. (Mention any 'two' points.) 

Name the species used in sericulture. Name the stages in the life cycle of a silk moth in cyclic form. 

Name the ‘two’ types of maps generated by H.G.P.

What is ‘syndrome’?

Explain the types of chromosomes on the basis of position of centromere.

Explain incomplete dominance with suitable example.

In which of the following disorders number of chromosomes present is 47?
(A) Turner’s syndrome
(B) Cushing’s syndrome
(C) Acquired Immuno - Deficiency Syndrome
(D) Down’s syndrome

Define Linkage.

Name the disorder caused by under secretion of thyroxine in children

Which of the following is an example of ZW – ZZ type of mechanism of sex determination?