Oogenesis begins with which of these structures?
a. sperm
b. secondary spermatocyte
c. polar bodies
d. spermatids
e. primary oocyte
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As many as one-half of Earth's plants
A. may already have gone extinct in the last 100 years. B. may be threatened with extinction at present. C. may be considered invasive species. D. are known to be medicinally useful. E. have been shown to be keystone species.
In septate fungi, what structures allow cytoplasmic streaming to distribute needed nutrients, synthesized compounds, and organelles throughout the hyphae?
A) multiple chitinous layers in cross-walls B) pores in septa C) complex microtubular cytoskeletons D) two nuclei E) tight junctions that form in cross-walls between cells
Hemophilia is an X-linked trait caused by the allele h. About 1 in 10,000 males (0.0001) has hemophilia. The frequency of the h allele in males is therefore _____________________
Fill in the blank(s) with correct word
The morphological approach to speciation is prone to misinterpretation. Which of the following is not
an example?
a. male birds with strikingly different plumage than females b. a chihuahua and a great dane that do not look alike c. snails that resemble each other, but cannot mate d. snails of quite varied appearance that can all interbreed e. snails of quite similar appearance that are shown to be different species via reproductive isolation