There are two main types of chromosomal disorders, those that take place on the 21st pair of chromosomes and those that

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

Nucleic acids offer variability because they contain alternate forms of genes called .

Explain the purpose of a molecular clock and the properties that a section of protein must have to be used in this way.