A cleft lip results when
A. the two halves of the secondary palate do not fuse.
B. the frontonasal and maxillary processes do not fuse.
C. the lateral edges of the nasal placodes do not fuse with the maxillary processes.
D. the maxillary processes do not fuse with the mandibular processes.
E. None of these choices is correct.
B
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The two types of information needed to predict the inheritance pattern of a trait are
A) the age at which the trait appears and how it affects males or females. B) the health of the mother and the father. C) the way genes are distributed in meiosis and the way that they come together when sperm joins egg. D) the way mitosis distributes the alleles of a gene and whether those alleles are dominant or recessive.
The veins
a. act as high-resistance passageways for blood flow from the tissues to the heart b. can serve as a blood reservoir by adjusting their total capacity to accommodate variations in blood volume c. contain one-way valves that prevent backflow as blood moves toward the heart d. have characteristics a and b e. have characteristics b and c
The organ that provides mechanical protection and nutritional support for the developing embryo is the
A) vagina. B) uterine tube. C) ovary. D) uterus. E) cervix.
Parasympathetic ganglia are called ________ ganglia.
A. dorsal B. terminal C. collateral D. pelvic E. chain