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Ø Who proposed the multiple factor hypothesis for the inheritance of quantitative characters - Nilson-Ehle
Ø Genes having individually small but cumulative effect on a character, they govern quantitative character is known as Polygenes
Ø The term polygenes was coined by Mather (1943)
Ø The appearance of individuals in F2 with very higher or lower intensity of expression than their both parents is known as Transgressive segregation
Ø The genes that can either initiate or block the expression of other genes is known as Regulator genes
Ø Test cross ratio of dihybrid is- 1:1:1:1
Ø The tendency of two or more genes to stay together during inheritance is known as Linkage
Ø The Group of genes situated on the same chromosome is known as linkage group
Ø Who first reported on sex linkage in the Drosophila - T.H. Morgan (1910)
Ø Any two genes on a particular chromosome is very close to each other and move together to the gametes and no recombination/cross overs/chiasma between these two loci is called as Completely linked genes
Ø Any two genes on the same chromosome but show moderate level of cross overs is known as Incompletely linked
Ø The exchange of strictly homologous segments between non sister chromatids of homologous chromosomes is called as Crossing over
Ø If genes at two loci are on separate chromosomes, then they segregate independently. These loci are said to be Unlinked
Ø The term crossover was first used by Morgan and Cattell (1912)
Ø The points at which the chromosomes actually cross over are called Chiasmata
Ø A line drawing showing the linked genes and the recombination frequencies between them is known as Linkage map, Genetic map or Chromosome map
Ø The frequency of recombination between two linked genes cannot exceed -50%
Ø Map unit is also known as - Morgan unit (1 centimorgan = 0.1 map unit)
Ø The tendency of one crossover to reduce the chance of another crossover in its adjacent region is called- Interference
Ø Sex chromosomes were first discovered by Me Lung in 1902, in grass hoppers
Ø Sex linked gene passes from male to female then back to male; such an inheritance pattern is known as Criss- cross inheritance
Ø The plant bears both female and male inflorescences on the same plant are referred to as Monoecious plant
Ø Inheritance due to genes located in cytoplasm is called as - Cytoplasmic inheritance
Ø The sum total of genes present in the cytoplasm of a cell or an individual is known as Plasmon
Ø First case of cytoplasmic inheritance was reported by Correns in 1909 in four 'O' clock plant
Ø Synthesis of protein (polypeptide chain) from m RNA molecule are referred to as Translation
Ø Deoxyribonucleic acids and their ability to form polynucleotide chain were discovered by Levene (1931)
Ø The amount of DNA present in the haploid genome of an organism is known as C-value
Ø The evidence for semiconservative replication of DNA was first presented by Meselson and Stahl in 1958.
Ø The junction between the unwound part and the open part is called Replication fork.
Ø Initiation codon for protein synthesis is-AUG (methionine).
Ø Stop codons-UAA, UAG, UGA
Ø The characteristic fruit of the family Poaceae is- Caryopsis
Ø Few species of plants other than those of poaceae which produce small grains and used as food as in the of cereals are referred to as Pseudo cereals.
Ø Tillering habit is more common in cereals except - Maize and Sorghum.
Ø The infloresence in rice is called as Panicle.
Ø Study of Fruits is known as Pomology.
Ø Growing of special crops for adding organic matter and Nitrogen to the soil and ploughing them in situ is called - Green manuring.
