HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions

Distinguish between human sperm and ovum.

Why the ratio in pleiotropy is 2 : 1? Explain it with an example.

If centromere is situated in the middle of the chromosome, it is called ________.

(a) Metacentric

(b) Acrocentric

(c) Submetacentric

(d) Telocentric

Give the genotype of Turner’s syndrome.

If the number of chromosomes in an endosperm cell is 27, what will be the chromosome number in the definitive nucleus?

1. 9
2. 18
3. 27
4. 36

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.