STD 12 - 7. human health and disease — NEET STD 11 Science — Question

The four daughter cells derived from a single meiosis differ from each other due to

Which one of the following statements are correct ?
(i) When an organism showing a dominant phenotype is crossed with the dominant parent instead of self crossing, then the cross is called test cross.
(ii) If the result of test cross shows half of the progeny with dominant trait and half recessive trait, then the unknown genotype of parent is interpreted to be heterozygous.
(iii) In incomplete dominance, the F₁, had a phenotype that did not resemble either of the two parents and is between the two.
(iv) In incomplete dominance, the phenotypic ratio is 3:1 and the genotypic ratio is 1:2:1.
(v) The study on plant Antirrhinum sp. is good example of incomplete dominance and that on ABO blood group in human being is an example of Co-dominance.
(vi) In case of Co-dominance, F₁, generation resembles both parents.
(vii) The phenotypic ratio of dihybrid cross is 9:3:1.
(viii) In 1900, three scientist de Vries, Correns and Von Tschermak independently rediscovered Mendel's result on the inheritance of character.
(ix) Sutton united the knowledge of chromosomal segregation with Mendelian principle and called it the chromosomal theory of inheritance.
(x) Morgan coined the term linkage to describe physical association of genes on a chromosome and the term recombination to describe the generation of parental gene combination.
(xi) The chromosomes involved in the determination of sex is designated as sex chromosome and the rest of chromosomes is called autosome.
Choose the correct option given below :-

Select the correct statement.

Which one of the following statements are correct ?
(A) The diffusion membrane is made up of three major layer squamous epithelium of alveoli, endothelium of alveolar capillaries and basement substance in between them.
(B) Total thickness of diffusion membrane is more than millimeter.
(C) Alveolar wall of alveoli is one celled thin wall.
(D) About 97% of O₂ and 20-25 % of CO₂ is transported by Hb in the blood.
(E) 3% of O₂ and 7 % of CO₂ is carried in a dissolved state through plasma of blood.
(F) O₂ bind with Hb in reversible manner to form oxyhaemaglobin. Each Hb molecule can carry a maximum of two molecules of O₂
(G) A sigmoid curve is obtained by plotting percentage saturation of Hb with O₂ against pO₂ . This curve is called oxygen dissociation curve.
(H) For the formation of oxyhaemoglobin in the alveoli, favourable factors are high pO₂, low CO₂ low pH and lower temperature.
(I) Every 100ml of oxygenated blood can deliver 5 ml of O₂ to the tissue under normal physiological conditions.
(J) CO₂ is carried by haemoglobin as carbamino - haemoglobin.
Choose the correct option given below :-

He demonstrated that life comes only frompre existing life

The total number of bones in your right arm is

Which one of the following component is the part of pectoral girdle

Erythroblastosis foetalis is a disease in which

Cretinism can be prevented or cured by the administration of