Which of the following cells shows the presence of a nucleus? prokaryotic cell eukaryotic cell both prokaryotic and eukaryotic cell

The correct answer is- Eukaryotic cell.

Eukaryotic cell (such as plant and animal cell) is the cell of eukaryotic organisms, which possesses a true nucleus and membrane bound subcellular organelles (such as mitochondria, endoplasmic reticulum, golgi complex).

On the contrary, prokaryotic cell (such as bacterial cell like E.coli) does not have nucleus and membrane bound subcellular organelles.

Thus, Eukaryotic cell is the right answer.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

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