Explain how a change in the sequence of nitrogen bases in a DNA molecule could result in a gene mutation. (your asnswerneeds to reference the definition of a gene)

Are SA citizens vaccinated against yellow fever? give two reason for your answer.

Suppose one parent is heterozygous for a dominant disorder and the other parent is homozygous normal. Draw a pedigree showing these parents and three possible offspring.

What kind of research is most likely to improve the health of the environment

What's mass? A. The sum of the number of protons and neutrons in an atom B. The force that gravity exerts upon an object OC. A measure of an element's attraction for electrons D. A measure of the amount of matter an object contains

Which statement is true about fossils? A) There are more fossils in warm, wet tropical areas. B) No fossils resemble organisms that are presently alive. C) The oldest fossils are found in layers closest to the surface.

Which is a sustainable practice? wind farms clear cutting flood irrigation overfishing

What happens in each phase of miosis.

Purple petal color in pea plants is dominant to white petal color. Two heterozygous pea plants are crossed. What ratio of the offspring will have white petals? Express this in a percentage.

What's the difference between anaerobic respiration and aerobic respiration?

What releases energy from food