The correct answer is: a gene may represent only a millionth of the cell's DNA.
The method used to amplify DNA fragments is called polymerase chain reaction (PCR). PCR is a technique used in molecular biology to produce thousands to millions of copies of a single targeted DNA sequence. When studying a specific gene, the scientist needs to be able to target and focus only on the DNA sequence which constitutes this exact gene. However, a gene is only a very small portion of an organism's genome. Therefore, the scientist uses PCR to amplify this DNA sequence and produce a large number of copies.
It is during the process of CELL DIVISION when the cell starts dividing and get converted from unicellular to multi cellular. The cell division can takes place by either mitosis or meiosis.
In mitosis 2 offspring cells are produced from one parent cell while in meiosis 4 offspring are produced from one parent cell.
Answer:
Un depredador y sus presas coevolucionan, el depredador se vuelve más eficiente en perseguir y matar a sus presas y las presas dearrollan nuevas defensas y formas de escape. La coevolución impone presiones selectivas. Éstas a su vez llevan a una carrera armamental de adaptaciones mutuas progresivas
Explanation:
Answer: c. iris – controls the pupil
Explanation:
The iris, a structure which is primarily made up of smooth muscles. These smooth muscles surrounds the pupil. The light enters the eye through pupil which is a black hole present in the middle of the eye. It allows the light to strike the retina. It controls the size of the pupil this way it helps in regulating the amount of light entering the eye. The pupil becomes wider in the darkness and becomes narrower when the light intensity is more. These actions are controlled by iris.