Exam 3: The New Genetics

Which mother is at greatest risk of having a child with a chromosomal abnormality?

In a heterozygous pair of alleles, the phenotype reflects one allele more than the other. This is referred to as a(n) _____.

A small section of a chromosome that is the basic unit for the transmission of heredity is a _____.

Genes affect disorders such as alcohol use disorder and nearsightedness, but research indicates that the environment plays a role as well.

Who is most likely to benefit from preconception, prenatal, or even prenuptial (before marriage) genetic counseling?

Michelle and Greg are having a baby and are hoping for a boy. _____ is the parent who is responsible for determining the sex of the baby.

Which is an example of a single-gene disorder that is dominant?

An individual's genetic inheritance is called a(n) _____.

A common reason that couples do not seek genetic counseling is that _____.

Genes influence every disorder, yet with each disorder _____ can make a difference in the expression and outcome.

Jenny learned in her high school science class that a female has _____ on the 23rd pair of chromosomes.

In 22 of the 23 pairs of chromosomes, both members of the pair are closely matched. Each of these 44 chromosomes is called a(n) _____.

Every person begins life as a single cell, which is called a _____.

Allen learned in his college biology class that, in sex chromosomes, the _____.

Eight-year-old Joe has no difficulty seeing things near him but sometimes struggles to see things in the distance. Joe gets his eyes checked and is told that he does not yet need corrective lenses for nearsightedness. Instead, drawing on current research, the ophthalmologist advises that he _____.

Age has been associated with chromosomal abnormalities in offspring in that the _____ a parent is at conception, the greater the risk of chromosomal abnormalities.

Which female is more likely to naturally conceive dizygotic twins?

On the 23rd pair of chromosomes, males have _____.

_____ cells are able to produce any other cells.

Dizygotic twins have _____ percent of their genes in common.