Genetics And Plant Breeding - Study Mode

[#696] Term 'Meiosis' was coined by
Correct Answer

(B) Farmer & Moore

Explanation

Solution: Term 'Meiosis' was coined by Farmer & Moore. The term "meiosis" is derived from the Greek word meaning 'lessening'. It was introduced to biology by J. B. Farmer and J. E. S. Moore in 1905, using the idiosyncratic rendering "maiosis". The spelling was changed to "meiosis" by Koernicke (1905) and by Pantel and De Sinety (1906) to follow the usual conventions for transliterating Greek.

[#697] The form and structure of growing cell is maintained due to
Correct Answer

(D) Turgidity

Explanation

Solution: The form and structure of the growing cell are maintained due to Turgidity. Turgidity is the point at which the cell's membrane pushes against the cell wall, which is when turgor pressure is high. The fact of being swollen or firm is usually because of being full of liquid. Water is essential to maintain the turgidity of cells, and ultimately to retain the proper form and structure of any cell.

[#698] The crossing over takes place in
Correct Answer

(C) Pachytene

Explanation

Solution: The crossing-over takes place in Pachytene . Pachytene is the stage of meiotic prophase that immediately follows the zygotene and is characterized by paired chromosomes thickened and visibly divided into chromatids and by the occurrence of crossing-over. During this stage, exchanges of chromosome material between maternal and paternal homologous chromosomes occur by crossing over. At the points of crossing over, bridges (chiasmata) are seen in variable numbers. Depending on the chiasmata, different aspects of the chromosomes can be observed.

[#699] Shaktiman is the new variety of
Correct Answer

(B) Maize

[#700] The increased performance of F 1 hybrid over its parents is called
Correct Answer

(B) Heterosis

Explanation

Solution: The increased performance of F 1 hybrid over its parents is called Heterosis . Heterosis refers to the phenomenon that progeny of diverse varieties of a species or crosses between species exhibit greater biomass, speed of development and fertility than both parents. Various models have been posited to explain heterosis, including dominance, overdominance and pseudo-overdominance.