An example of a single gene trait with two alleles would be

The phenotypes for human blood type are

How many pairs of chromosomes do humans have?

If a human is a girl, her sex chromosomes are

Sex-linked genes are genes found on the X and Y chromosomes. Which of the following is a sex-linked trait?

Sickle-cell disease affects hemoglobin, a protein in red blood cells that carries oxygen. Which of the following statements are true?

In Down syndrome, a person's cells have an extra copy of chromosome

A _______________ is a chart or "family tree" that tracks which members of a family have a particular trait.

The end result of cloning is an organism that has mostly the same genes as the organism from which it was produced.

Gene therapy may someday help correct genetic disorders by inserting copies of the defective gene directly into a person's cells.

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