MCQ
Which substances when present in high level can activate the chemosensitive area present adjacent to rhythm centre?
- A$CO_2$ and $O_2$
- B$HCO _{3}^{-}$ions and $O _{2}$
- ✓$CO _{2}$ and $H ^{+}$ions
- D$H ^{+}$and $HCO _{3}^{-}$ions
✓
Answer
Correct option: C.
$CO _{2}$ and $H ^{+}$ions
c
Chemosensitive area i.e. sensitive for chemicals and is located adjacent to the rhythm centre which contains chemoreceptors which are sensitive for $CO _{2}$ and $H ^{+}$ions. The respiratory centre is stimulated by concentration or partial pressure of $CO _{2}$ and $H ^{+}$ions in blood and body fluids.
Chemosensitive area i.e. sensitive for chemicals and is located adjacent to the rhythm centre which contains chemoreceptors which are sensitive for $CO _{2}$ and $H ^{+}$ions. The respiratory centre is stimulated by concentration or partial pressure of $CO _{2}$ and $H ^{+}$ions in blood and body fluids.
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(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.
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