HSC Science (General) १२ वीं कक्षा - Maharashtra State Board Important Questions

Describe hormonal control in various phases of the menstrual cycle.

Expand the term ZIFT.

What is a test cross?

Answer the following questions related to sex determination in human beings:
i. What is sex chromosome?
ii. How many pairs of chromosomes are present in human beings?
iii. How is the sex of the human offspring determined?
iv. Draw a diagram depicting sex determination in man.

Explain the mechanism of sex determination in birds.

What is the reason for the 21^st trisomy?

Give reasons for the development of Turner’s syndrome and also mention its symptoms.

Identify chromosomal disorder caused due to non-disjunction of the 21^st number of chromosomes and enlist its symptoms.

______ enzymes are used as biological scissors in r-DNA technology.

What is Bacteriophage?

What is degeneracy of genetic code?

How t-RNA act as an adapter molecule?
Explain in detail with the help of a diagram.

Give any ‘two’ factors responsible for genetic variation.

Define the term gene flow.

The proportion of an allele in the gene pool to the total number of alleles at a given locus is called _______.

Any random fluctuation in allele frequency, occurring in the natural population by pure chance is called __________.

Name any three types of premating isolating mechanisms.

Name any three types of postmating isolating mechanisms.

Write down the three main concepts of the modern synthetic theory.

Write a note on the significance of Palaeontology.