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A woman who can roll her tongue (presumably dominant) is married to a man who cannot roll his tongue. Two of their four children can roll their tongues and two cannot. If A= roll tongue and a= cannot roll tongue, then what is the genotype of the parents?

If one parent has type B blood and the other has type AB, what type(s) might the child have? Consider all possibilities.

Normally a child with a dominant trait does NOT have a parent with the trait.

If the genotype of an organism is heterozygous (Aa) for a trait, what kinds of gametes could this organism produce?

If a person inherits two X chromosomes, this individual will be _____.

The bonds that hold complementary strands of DNA together are _____.

Down Syndrome is caused by a nondisjunction during meiosis. What would the karyotype look like?

A recessive allele is expressed in the absence of its dominant allele.

A genetic condition characterized by a female with only one X chromosome, immature sex organs, sterility, and no secondary sex characteristics is referred to as

The two strands in the DNA molecule are _____.