Exam 3: Seciton 3: Beginnings: Heredity and Environment

Sally is born with 47 chromosomes instead of the usual 46. Sally's chances of survival are _____.

The cognitive deficits caused by the genetic condition of _____ are the most common form of inherited mental retardation.

In in vitro fertilization (IVF), to improve the odds of fertilization, a sperm often is inserted directly into each ovum. This procedure is called _____.

When the effects of genes add up to make the phenotype, they are called _____ genes.

Almost every trait is _____, which means it is affected by many genes.

The heritability for human traits, such as nearsightedness, _____.

Most recessive genetic disorders are _____.

Approximately once in every _____ births, a newborn survives with 45, 47, or even 48 or 49 chromosomes instead of the usual 46.

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

Which female is more likely to naturally conceive dizygotic twins?

Consultation and testing by trained experts that enable individuals to learn about their genetic heritage, including harmful conditions they might pass along to any children they may conceive, is referred to as _____.

All living things are composed of cells. The work of cells is done by _____.

Most of the known single-gene disorders are _____.

Birth defects and later illness _____ with in vitro fertilization (IVF).

A fatal central nervous system disorder caused by a copy number variation-more than 35 repetitions of a particular set of three base pairs-is _____.

In the United States about _____ of in vitro fertilization (IVF) babies are twins or triplets.

Michael is color-blind. His gene for color blindness is most likely a _____.

A variation that makes a gene different in some way from other genes for the same characteristics is a(n) _____.