Genetic drift in a small population for multiple generations can significantly affect the composition of a population’s gene pool. Following some observation are given for reason of Genetic drift?

A) Small populations are threatened by a loss of genetic variability. This loss may be caused by inbreeding, genetic drift, and limited mating.

B) Sampling error can arise is through the founder effect, which is due to the limited matting within population

C) Genetic drift arises is through a genetic bottleneck, which develops when a population undergoes a drastic reduction in population size.

D) Variance in allele frequency due to genetic drift will be maximal when one allele is very rare and the population size is small.

Which of the above observation are true?

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#Question id: 14831

#Unit 2. Cellular Organization

A spirochete is a member of the phylum Spirochaetota, which contains distinctive diderm gram-negative bacteria, most of which have long, helically coiled cells. Movement of spirochetes occurs by means of structures called 

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#Question id: 14832

#Unit 2. Cellular Organization

The characteristic virulence factor of S. pneumoniae is

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#Question id: 14833

#Unit 2. Cellular Organization

The pneumococcal vaccine is directed against the

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#Question id: 14834

#Unit 5. Developmental Biology

Process by which a spatial and temporal pattern of cell activities is organized within the embryo so that a well-ordered structure develops:

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#Question id: 14835

#Unit 5. Developmental Biology

There are three main ways in which inducing signals may be passed between cells EXCEPT

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#Question id: 14836

#Unit 5. Developmental Biology

In the case of the French flag model. we assume a source of morphogen at one end and a sink at the other and that the concentrations of morphogen at both ends are kept constant but are different from each other. If the cells can respond to threshold concentrations of the morphogen, Thresholds can represent the

a. amount of morphogen that must bind to receptors to activate an intracellular signaling system. 

b. concentrations of transcription factors required to activate particular genes.

c. concentration at any point effectively provides positional information.

d. amount of morphogen that must bind to receptors to inactivate an extracellular signaling system.