The process that changes a chlorine atom into a chloride ion is a reaction known as a reduction reaction. In chemistry an atom of a particular element is said to be reduced when it gains an electron (from another atom). Reduction is the direct opposite of a reaction called oxidation where an atom loses or gives up an electron and is thus said to be oxidized. When these two reactions occur at the same interval on the same elements then the reaction is called a redox reaction.
When chlorine, a non metal reacts with a metal such as sodium, chlorine gains an electron from sodium and becomes reduced to form a chloride ion with a negative charge while sodium which gives up the electron becomes oxidized to become a sodium ion that is positively charged. The two elements form an ionic bond between them and become a totally new substance called sodium chloride , which is the salt we use at the table.
Answer:
The correct answer to the definition of a dominant allele is the allele that stops or hides the expression of another allele in an organism (B).
Explanation:
The expression seen, usually called phenotype is controlled by genetic compositions enclosed within the chromosomes in the nucleus, if eukaryotes, or nucleoid, if prokaryotes. The chromosome is a pair of two alleles, which are responsible for the trait, with the two possibilities that can be seen. The allele which has the potential of silencing the other allele is called the dominant allele, they are usually represented in capital letters, they will dictate the phenotype of the organism even in the presence of the other allele. This other allele is called recessive allele, which are only expressed when they are homozygous. Dominant allele expresses themselves both in heterozygous and homozygous genotype.
The best answer is A.) They can poison soil organisms, because pesticides contain chemicals that can be dangerous to plants.