A unit of heredity contaning the information for a particular charactersitic is called a ________. One of several alterative forms of these units is an _______.

True or False: When red snapdragons are crossed with white snapdragons to produce pink snapdragons, this is an example of polygenic inheritance.

Each normal human possesses in his or her body cells

A _______ is an individual heterozygous for a recessive trait

True or False: A person with Turner syndrome is XXY

When two plants with red flowers are mated together, the offspring always are red, but if two purple-flowered plants are mated together, sometimes some of the offspring have red flowers. Which flowered color is dominant?

Which of the following best describes fertile females with normal phenotypes?

True or False: A person with Klinefelter syndrome is a male.

Squash may be either white or yellow. However, for a squash to be white, at least one of its parentsmust also be white. Which color is dominant?

In sheep, white (B) is dominant to black (b). If a pure-breeding white ram is crossed with a pure-breeding black ewe, the phenotypic ratio is ________ and the genotypic ration is __________.

A man who carries a harmful X-linked gene will pass the gene on to

Which of these is not a genetic disorder?

True or False: Alternate forms of a gene are called chromatids.

The physical location of a gene on a chromosome is its _______

A recessive allele on the X chromosome causes colorblindness. A woman who is a carrier for colorblindness has children with a man with colorblindness. What is the chance their son will be colorblind?

Explain why an organism's genotype may be homozygous dominant, homozygous recessive, or heterozygous, but never heterozygous recessive.

If a recessive allele helps an organism reproduce, but the dominant allele hinders reproduction, which will be more common in a population?

What do the grid boxes in a Punnett square represent?

Why does the expected genotypic ratio often differ from the expected phenotypic ratio resulting from a monohybrid cross?

Briefly explain how sexual reproduction generates new allele combinations in offspring.

Describe how sex-linked genes are expressed differently in males and in females.

How is incomplete dominance expressed in a phenotype?

What are the possible genotypes from a mom who has type A blood and a dad with type B blood? (hint: both parents are heterozygotes)

An organism is described as Rr:red. Rr is the organism's __________, while red color is its ____________. Would this organism be homozygous or heterozygous?

In mammals, males have _______ sex chromosomes and females have ______ sex chromosomes.

Which parent determines the sex of the offspring?

The exchange of corresponding segments of the chromatids of two homologous chromosomes during meiosis is called ________.

True or False: In a heterozygote, the gene that is not expressed is recessive.

An error in meiosis in which chromosomes fail to segregate properly into the daughter cells is called ________.