Exam 3: Seciton 2: Beginnings: Heredity and Environment

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) _____.

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

If the 23rd pair of chromosomes is a(n) _____, the individual will be female.

When an ova is surgically removed from an ovary, fertilized in a glass lab dish, and then inserted into the uterus, this process is referred to as _____.

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

As urbanization, video games, homework, and fear of strangers has kept more American children indoors, the rate of _____ has increased.

The first 22 chromosomes contain hundreds of genes in the same positions and sequence. If the code of the gene from one parent differs from the code on the same gene from the other parent, the gene pair is _____.

The interaction of a heterozygous pair of alleles in such a way that the phenotype reflects one allele more than the other is referred to as a ______.

Identical twins are also called _____ twins.

Jenny and Tina are identical twins. They are the result of _____.

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

Most of the known single-gene disorders are _____.

Monozygotic twins have _____ percent of their genes in common.

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

Fraternal twins are also called _____ twins.

Genes with various repeats or deletions of base pairs are referred to as _____.

_____ cells are able to produce any other cells.

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

The first 22 chromosomes contain hundreds of genes in the same positions and sequence. If the code of the gene from one parent is exactly like the code on the same gene from the other parent, the gene pair is _____.

Each variation of a gene is called a(n) _____.