STD 12 - 4. principal of inheritance and variation — NEET STD 11 Science — Question

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and formation of X shaped structures called chiasmata
Reason(R): In oocytes of some vertebrates, diplotene can last for months or years.
In the light of the above statements, choose the correct answer from the options given below:

Mendel's contribution for genetic inheritance was

The pituitary gland is divided into two major parts, adenohypophysis and neurohypophysis. Which of the following characters are incorrect ?
(i) The pituitary gland is located in a bony cavity called sella tursica.
(ii) Adenohypophysis consists of two portions, pars distalis and pars intermedia while neurohypophysis consists of one portion, pars nervosa.
(iii) The pars nervosa commonly called anterior pituitary, produces LH and FSH.
(iv) Pars intermedia secretes melanocyte stimulating hormone (MSH).
(v) Pars distalis also known as posterior pituitary, stores and releases two hormones called oxytocin and vasopressin.
(vi) In humans, the pars intermedia is almost merged with pars distalis.
(vii) Hormone of posterior pituitary actually synthesised by the hypothalamus.

Body does not show any segmentation in

Misuse of amniocentesis results in

One of the strands of double stranded DNA has base composition as follows: 15% A, 15% T, 40%G and 30%C. What will be the percentage of these bases in the complementary strand?

Which technique uses the body's water molecules as the bases for its images?

Which of the following part contains centers, control respiration cardiovascular reflexes and gastric secretions