B_T_2015_02_

SECTION - A Pick out the monoecious plant from the following. (a) Coccinia (b) Papaya (c) Cucumber (d) Date palm The given figu ...

SECTION - C (i) Draw a neat and labelled diagram of a fertilized embryo sac. (ii) Describe briefly the type of fertilization f ...

(iii) Name the type of age pyramid in which the number of pre-reproductive and reproductive individuals are almost same. (i) Wh ...

according to the data given, the f 3 progeny shows a typical Mendelian monohybrid phenotypic ratio of the dominant and recessiv ...

(ii) Double fertilization is found only in angiosperms. It is the fusion of two male gametes, brought by a pollen tube, with two ...

successfully due to adaptation in the polluted areas of england. This evolution of dark, melanic variety of moths, in response t ...

or foreign DNa is linked with the plasmid DNa, we can multiply its number equal to the copy number of the plasmid. This principl ...

(ii) Gametogenesis occurs at puberty in the human male. In the female, it begins before birth but arrests at the primary follicl ...

• The normal functioning of the genetic system in an organism is maintained by the constancy of the hereditary material carri ...

• Chromosomal mutations are studied under two broad categories: (A) Changes in chromosomal morphology/structure or chromosoma ...

for normal eye, located on X-chromosome duplicates, the eyes become smaller, resulting in a disorder called Bar eye. • In gen ...

• This phenomenon has occurred in the phylogeny of many species, and has led to a reduction in the number of chromosomes. Thi ...

hypoploidy • Hypoploidy is further of two types : monosomy and nullisomy. monosomy • The organisms having genetic consti ...

• Important examples of trisomy in human beings with 2 n = 47 are : (i) Down’s syndrome or Mongolian idiots (Mongolism) • ...

Down’s syndrome • Chromosome analysis has shown that, while the additional chromosome may be derived from either the mother o ...

euploidy • The organisms having one or more complete sets of chromosomes, or organisms having chromosome number which is whol ...

of ancient genome duplications shared by many species. • Polyploid plants can arise spontaneously in nature, by several mecha ...

Organism with single genome, i.e., ‘A’ – haploid. Organism with two similar genomes, i.e., ‘AA’ – autodiploid. Organism with th ...

octaploid Triticale hexaploid Triticale (c) Wheat • Common wheat (Triticum aestivum) is an important example of natural all ...

Which of the following cannot be detected in a developing foetus by amniocentesis? (a) Down’s syndrome (b) Jaundice (c) Klinefe ...