A condition with the presence of a single X chromosome and no homologous X or Y is termed _______ syndrome.
The interchange of genetic material between nonhomologous chromosomes.
Down syndrome characteristics include mental retardation, low nasal bridge, __________ ________, protruding tongue, low-set ears, poor muscle tone, and short stature.
The study of biologic inheritance.
The incidence of Down Syndrome occurs with increased maternal ____.
DNA has _____ components.
Gametes are ______ cells and have only 1 member of each chromosome pair, for a total of 23 chromosomes.
DNA _______ consists of breaking the weak hydrogen bonds between the bases, leaving a single strand with beach base unpaired.
Proteins are composed of one or more _______, which consists of sequences of amino acids.
_________ syndrome includes at least two X chromosomes and one Y.
DNA appears like a twisted ladder with chemical bonds as its rungs called a double-_____ model.
________ cells are from an individuals mother and father that each contribute one chromosome per pair.
_________ are usually more harmful than excess genetic material, so duplication's usually have less serious side effects.
The site of actual protein synthesis.
_________ and guanine, are double carbon-nitrogen rings called purines.
Each somatic cell nucelus has forty-____ in 23 pairs.