Each renal calyx
A. is a funnel-shaped structure.
B. surrounds the tip of a renal pyramid.
C. joins to form the renal pelvis.
D. has all of these characteristics.
E. has none of these characteristics.
Answer: B. surrounds the tip of a renal pyramid.
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Many species of angiosperms are self-incompatible due to the presence of the ____ -gene
Fill in the blank with the appropriate word.
Which of the following linkage maps correctly shows the order and distance between the y, f, and v genes?
In Drosophila, the genes y, f, and v are all X-linked. Females who are homozygous for recessive alleles of all three genes (y f v / y f v) are crossed to wild-type males. The resulting trihybrid F1 females are testcrossed. The F2 are distributed as follows:
A) f——35 m.u.——y——15 m.u.——v
B) f——22 m.u.——y——15 m.u.——v
C) y——35 m.u.——f——22 m.u.——v
D) y——22 m.u.——v——15 m.u.——f
E) y——15 m.u.——v——22 m.u.——f
Analogous features are problematic when constructing evolutionary tree because they are
a) based on DNA instead of comparative anatomy b) based on comparative anatomy instead of embryology c) monophyletic instead of convergent d) the result of common ancestry instead of natural selection e) the result of natural selection instead of common ancestry
In humans, which genetic mechanism led to the formation of the X and Y chromosomes?
A. Translocation B. Nondisjunction C. Inversion D. Reduced crossing over E. Insertion