If a study of several pedigrees demonstrates that two
parents are normal but some of their children express
a trait, then the trait is controlled by a
a. codominant gene.
b. simple dominant gene.
c. recessive gene.
d. sex-linked gene.
e. No conclusion can be drawn.
Answer: c
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The ABC model explains the process of _______
A. brain development B. flower development C. sex determination D. muscle development
You would find a closed circulatory system in
A. cockroaches. B. snails. C. squid. D. earthworms. E. squid and earthworms.
In the presence of water, nonpolar associations form between molecules or regions of molecules that
are ____.
a. partially charged b. hydrophobic and hydrophilic c. hydrophobic d. fully charged e. hydrophilic
The gene encoding coat color is X-linked, and male cats have a single copy of the X chromosome. They can therefore express either the O or o allele, resulting in orange or black coat, respectively
Female cats, on the other hand, have two copies of the X chromosome. Thus, they can be heterozygous and express either orange or black. Using this information, list the possible genotypes for these individuals: • orange male • orange female • black male • black female • tortoiseshell