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

Nematocysts take part in

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 :-

Chromosomal number in a cell of a flowering plant is

A man homozygous for brown colour marries a lady heterozygous for brown colour is dominant. What will be the fate of their children

Set of useful insects is

Assertion: Adipose tissue is a type of loose connective tissue located mainly beneath the skin.
Reason: The cells of this tissue are specialised to store fats and loosely arranged in a semi-fluid ground substance.

Immunity tolerance developed by

Which one of the following is a cartilaginous fish