Biology- One-Liners- for various competitive examinations
Thank You all for landing on the page of Biology. The subject Biology plays an important role in various competitive examinations conducted by various organizations. Biology One-Liners help a lot.
The subject plays an important role in various competitive examinations conducted by various organizations. Biology bits help a lot.
1- The chromosomal theory of heredity implies that genes are located on the chromosomes and are transmitted to the next generation through them.
2-In a monohybrid cross the Fi ratio of a backcross is 1:1.
3-DNA duplication occurs in meiosis I and mitosis.
4-A giant chromosome having many chromonemata lying side by side all along their length is called polytene chromosome.
5-Transfer of a gene or genes through a virus is called transduction.
6-The condition in which only one allele of a pair is present is known as Hemizygous.
7-In humans, an example of a sex-linked trait is Colour-blindness.
8-The genetic constitution of an organism is known as Genome.
9-Mutations which are not dominant are not lost by a gene pool. This is known as Hardly-Weinberg law.
10-Phenylketonuria disease results from the genetic inability to synthesize a single enzyme.
11-When two genes are situated very close to each other in a chromosome no crossing-over can ever take place between them.
12-If an individual does not breed true for its characters, it is called a hybrid.
13-The science dealing with the study of inheritance and variation is Genetics.
14-A codon is a sequence of 3 nucleotides on m-RNA.
15-An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as monohybrid.
16-Reverse transcription was discovered by Temin.
17-Linked genes may be separated by the process of segregation.
18-The segment of DNA which participates in crossing over is known as recon.
19-Klinefelter’s syndrome is developed when the chromosome in the male is XXY, XXXY, and XXYY.
20-Chromosomes exhibit minimum coiling during interphase.
21-A functional unit of a gene which specifies synthesis of one polypeptide is known as cistron.
22-Crossing over in meiosis occurs in diplotene.
23-Dyad is a pair of sister chromosomes.
24-The nuclear membrane completely disappears during late prophase.
25-Linkage is inversely related to crossing over.
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