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: 15747

#Unit 5. Developmental Biology

In Drosophila, if there is two X chromosome and three sets of autosomes then the fly is:

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#Question id: 15746

#Unit 5. Developmental Biology

In Drosophila, if there is one X chromosome and three sets of autosomes then the fly is:

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#Question id: 7285

#Unit 5. Developmental Biology

During xenopus gastrulation, C3a functions as a short-range chemoattractant to guide the radial intercalation movements of cells. If Knockdown of C3a with antisense morpholinos results:

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#Question id: 7284

#Unit 5. Developmental Biology

Choose the correct match.

Genes	Axis polarity
a. Maternal deficiency of gurken	i. Posteriorization of follicle cells
b. Maternal deficiency of torpedo	ii. Ventralization of embryo
c. Maternal deficiency of toll	iii. Dorsalization of embryo
	iv. No anterior posterior axis

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#Question id: 7283

#Unit 5. Developmental Biology

The Drosophila orthodenticle gene and the vertebrate Otx genes are homologous and provide a good example of the conservation of gene function during evolution. Which of the following statement is correct regarding to the expression of gene expression.

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#Question id: 7282

#Unit 5. Developmental Biology

In humans, neural tube closure defects occur in about 1 in every 1000 live births. Failure to close the neural tube can result from both genetic and environmental causes. A recent report has demonstrated that zinc deficiency disrupts neural tube closure by: