Down syndrome is the result of an extra chromosome 21 in a gamete. What caused this to happen?

nondisjunction

telomeres

environment

chromosome inactivation

Assume that during meiosis I, none of the CC chromosomes disjoin at metaphase, but they separate into dyads (instead of monads) during meiosis II. Each resultant gamete participated in fertilization with a normal haploid gamete.

Which example describes animals living in a social hierarchy

What is the primary function of hormones? 1) act as chemical messengers that regulate the metabolic function of cells in the body 2) influence metabolic activity of glands by electrochemical impulses 3) activate extracellular enzymes function as

Which assumption must be correct for a population to be in hardy-weinberg equilibrium for a specific gene? see section 23.1 (page 458) ?

The scientist credited with being the first person to observe bacteria is a. robert hooke b. anton van leeuwenhoek c. albert einstein d. isaac newton

What kind of cells is an amoeba?

What happens when you get scared "Half to death twice"?

Atoms of different elements combine to form

How does mRNA differ from DNA? a. mRNA contains ribose sugars; DNA contains deoxyribose sugars. b. mRNA contains the base uracil; DNA contains the base thymine. c. mRNA is single-stranded; DNA is double-stranded. d. All of the above are correct.

Type of sponge that mimic synthetic sponge