STD 11 - 4. Animal kingdom — NEET STD 11 Science — Question

White matter is composed of

Dolphins are

Mating between two individuals differing in genotye to produce genetic variation is called

Statement I: P wave in ECG represents the depolarization of the atria.
Statement II: QRS complex represents the repolarization of the ventricles.

Epinephrine and norepinephrine together known as:

Arthropoda is differentiated from annelids by

Read the following
(i) Grasshopper is an example of XO type of sex determination in which males have only X- chromosome besides autosomes, whereas female have a pair of X-chromosome.
(ii) In mammals including man, XY type of sex determination is seen where both male and female have same number of chromosome.
(iii) The XO and XY sex determination mechanism are designated to be example of female heterogamety whereas ZW sex determination mechanism are designated to be example of male heterogamety.
(iv) In birds the female have zw chromosome whereas males have zz chromosome besides autosomes.
(v) The mutation arising due to change in a single base of DNA is known as point mutation.
(vi) The chemical and physical factors that induce mutation are reffered to as mutagens.
(vii) An analysis of traits in a several generation of a family is called pedigree analysis.
(viii) In pedigree analysis the symbol represents affected individuals and the symbol represents consanguineous mating.
(ix) Sickle-cell anaemia and phenylketonuria are example of X-linked recessive trait.
(x) Myotonic dystrophy is example of autosomal recessive trait.
(xi) Haemophilia is sex-linked recessive disease in which heterozygous female may transmit the diseases to sons.
choose the option with incorrect statements :-

If myelin sheath is continued in myelinated nerve fibre then what will happen in neuronal conduction?