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Gene therapy may someday help correct genetic disorders by inserting copies of the defective gene directly into a person's cells.
hemophilia
XX
The allele for the sickle-cell trait is codominant with the normal allele.
21.
True
pedigree
23
A, B, AB, and O
If a human is a girl, her sex chromosomes are
hemophilia
XX
The allele for the sickle-cell trait is codominant with the normal allele.
21.
True
pedigree
23
A, B, AB, and O
A _______________ is a chart or "family tree" that tracks which members of a family have a particular trait.
hemophilia
XX
The allele for the sickle-cell trait is codominant with the normal allele.
21.
True
pedigree
23
A, B, AB, and O
In Down syndrome, a person's cells have an extra copy of chromosome
hemophilia
XX
The allele for the sickle-cell trait is codominant with the normal allele.
21.
True
pedigree
23
A, B, AB, and O
Sex-linked genes are genes found on the X and Y chromosomes. Which of the following is a sex-linked trait?
hemophilia
XX
The allele for the sickle-cell trait is codominant with the normal allele.
21.
True
pedigree
23
A, B, AB, and O
Sickle-cell disease affects hemoglobin, a protein in red blood cells that carries oxygen. Which of the following statements are true?
hemophilia
XX
The allele for the sickle-cell trait is codominant with the normal allele.
21.
True
pedigree
23
A, B, AB, and O
How many pairs of chromosomes do humans have?
hemophilia
XX
The allele for the sickle-cell trait is codominant with the normal allele.
21.
True
pedigree
23
A, B, AB, and O
The phenotypes for human blood type are
hemophilia
XX
The allele for the sickle-cell trait is codominant with the normal allele.
21.
True
pedigree
23
A, B, AB, and O
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