Heredity and Genetics Answers

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Which of the following statements BEST describes chromosomes?

Humans have 460 chromosomes in every cell.

Chromosomes are arranged in 230 pairs.

Chromosomes carry the codes for hereditary traits.

Chromosomes are found outside the nucleus of each human cell.

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When describing Down syndrome, it's important to note that __________.

it can be classified as a single-gene disorder

it is caused when red blood cells cannot properly form hemoglobin

it causes infected males to have low testosterone levels

it is usually caused by three copies of chromosome 21

Gene testing is foolproof since it scans the building blocks of humans.

The normal function of a gene is to __________.

encode a protein

prevent illness

mutate into other cells

determine personality

Heredity refers to the __________.

removal of DNA from the human body

formation of chromosomes from DNA

many types of female genes

passing of traits from parents to children

Amniocentesis is a test in which fluid is removed from the uterus so the baby's genetic composition can be determined.

Chromosomes are composed of DNA.

Which of the following are types of hereditary disorders?

single-gene and chromosomal

complex and duplex

single-gene and duplex

all of the above

Dominant traits include __________.

cleft chin and attached earlobes

dimples and attached earlobes

dimples and no widow's peak

cleft chin and free earlobes

Genes are segments of a chromosome that are responsible for specific hereditary traits.

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