Answer:
Example of the Epistasis in plants is observed in the "summer squash".
Explanation:
Epistasis refers to a gene interaction in which one gene is masked by the other gene and affect the phenotype. The gene which masks the other gene is known as the epistatic gene and the gene which is being masked is known as the hypostatic gene.
The epistasis gene effect is observed in which more than one gene controls the same phenotype.
The example can be observed in the summer squash fruits in which more than one gene controls the color of the fruit.
The summer squash can be controlled by the white allele (W), Yellow allele (G) and the green by the recessive form of the w and g. If the W gene is present than it masks the other allele and thus white colour becomes dominant and is considered the case of the dominant epistasis.
Answer
Ions
Explanation
Some atoms gain or lose electrons during a chemical reaction. Positive ions are those that form when atoms loses an electron (a –ve charge). The ion formed when an electron is lost or donated is called a cation. When electrons are gained, an Anion is formed. Cations have net + charge where as Anions have a net negative charge.
Answer:
It enables it to be left with little or no resistance
Explanation:
The pinewood nematode , Bursaphelenchus xylophilus is a plant-parasitic nematode that causes severe death of pine trees.
The pine trees developed a mechanism over the years by producing a chemical compound called α-pinene . This helps in fighting against the nematodes. If enzymes are produced to digest this chemical then the pine wood nematode will thrive well and result in the death of the pine trees.
Answer:
The survival of a species depends more on the population because a population contains many type of organisms of the same species. Some of them are better adapted to survive the conditions provided by the Earth and hence, they live and produce offsprings with the favourable traits. The members of a population which are not better adapted mostly do not survive.
Hence, the survival of a species depends on the population where it is living.
We will attempt to introduce a gene responsible for the resistance to the antibiotic ampicillin.
Bacterial transformation is a molecular technique widely used in genetic engineering. Its basis involves the introduction of a foreign DNA into a host organism. This will result in the expression of a foreign gene by the host bacterium. In this example, our host organism is a bacterium who is sensitive to the antibiotic ampicillin. By introducing a gene for resistance to this antibiotic, the bacterium will become ampicillin resistant.
