One of the important assumptions made during the study of heritability in twins is that monozygotic twins share all their ____________________ and their ____________________
Fill in the blank(s) with correct word
genes; environment
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Cross-sectional surveys are very useful in establishing cause of a disease
Indicate whether this statement is true or false.
Experiments on selective adhesion between ectoderm, mesoderm, and endoderm derived from amphibian embryos
demonstrated that ____.
a. ectoderm cells have positive affinity for mesoderm cells but negative affinity for endoderm cells b. ectoderm cells have negative affinity for mesoderm cells but positive affinity for endoderm cells c. mesoderm cells have negative affinity for endoderm and ectoderm cells d. ectoderm cells have positive affinity for both endoderm and mesoderm cells e. endoderm cells have positive affinity for both ectoderm and mesoderm cells
You've stumbled upon a thick mat of moss in the woods. Upon closer inspection, you observe sporophytes emerging from the gametophytes. From your previous biology course, you know that the sporophyte is attached to a(n)
A) archegonium. B) antheridium. C) embryo sac. D) female cone. E) flower.
Most plants absorb water and minerals from the ________ and transport them through the ________.
A. atmosphere; xylem B. soil; phloem C. atmosphere; phloem D. soil; xylem