In heterosporous plants, megaspores form in ____ and give rise to ____
a. megasporangia; egg-producing female gametophytes
b. megasporangia; sperm-producing male gametophytes
c. microsporangia; egg-producing female gametophytes
d. microsporangia; sperm-producing male gametophytes
e. megasporangia; both egg-producing and sperm-producing gametophytes
ANSWER: a
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Huntington disease is _____
a. a model of a multifactorial trait, controlled by several genes b. inherited as an X-linked dominant trait c. a disease with onset in early childhood d. one that produces no significant changes in brain cells e. a model of a single gene defect affecting behavior
NEW: In cats, the gene for coat color is found on the X chromosome. Shown below is a mass of cells making up an early female cat embryo. The X chromosomes are shown in each cell; this embryo has one orange coat color allele (O) and one black coat color allele (B). Which of the following is ACCURATE about this embryo?
A. It will give rise to a calico cat.
B. It will give rise to a black cat, because black is dominant to orange.
C. It will give rise to an orange cat, as the paternal chromosomes carrying the black allele will be inactivated.
D. Since it is heterozygous, it will give rise to a cat with two Barr bodies in each cell.
E. Since it is heterozygous, it will give rise to a calico cat with two Barr bodies in each cell.
Which of the following references clusters of connected neurons?
a. nerve lobes b. attenuations c. motor nerves d. ganglia
Which of the following is a type of gland that
lacks ducts?
a. endocrine b. muscular c. nervous d. exocrine e. connective