An embryo with two X chromosomes will develop female characters because of
a. the presence of female hormones in development.
b. the absence of testosterone during early embryology.
c. the SRY regions of the X chromosomes.
d. maternal substances passed to the zygote during fertilization.
e. human chorionic gonadotropin.
B
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The internal body fluids of an osmoconformer can best be described as having:
A. roughly the same total solute concentration as the external environment. B. a higher solute concentration than the external environment. C. a lower solute concentration than the external environment. D. all of the same concentrations of particular ions as the external environment. E. None of the answer options is correct.
What is the correct order of these events in recombination that is resolved by the crossover pathway?
1. Double-strand break formation 2. Strand invasion 3. Resection 4. Resolution of the double Holliday junction 5. Branch migration 6. Formation of a double Holliday junction A) 6, 1, 2, 5, 3, 4 B) 1, 2, 5, 3, 6, 4 C) 6, 4, 1, 2, 5, 3 D) 1, 3, 2, 6, 5, 4 E) 1, 2, 3, 5, 6, 4
Fossils of the earliest known true hominins are
approximately how many millions of years old? a. more than 20 b. about 10 c. between 7 and 2 d. less than 0.5 e. none of these
An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive streak must be that of _____
A) an insect B) an amphibian C) a bird D) a sea urchin