If a gene has two alleles, there are two possible genotypes.

a. True

b. False

b. False

Explanation:

Genetics can be defined as the scientific study of hereditary in living organisms such as humans, animals and plants.

Heredity refers to the transfer of traits (specific characteristics) from the parent of a living organism to her offspring through sexual reproduction or asexual production. Some examples of hereditary traits are dimples, tongue rolling, baldness, handedness, freckles, curly hair, color blindness, height, etc.

According to Mendel's Law of Dominance, if a gene has two alleles, there are three (3) possible genotypes.

The three (3) possible genotypes are;

I. A combination of alleles such as AA.

II. A dominant combination (phenotype) such as Aa.

III. A recessive combination such as aa.

Where;

Also, a single version of a gene expressed by a living organism is referred to as an allele.

good thing- during decomposition the organic molecules in organic matter are broken down into simpler organic molecules that require further decomposition or into mineralised nutrients

bad thing- it can be harmful in crop productivity

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."