Human cells have

a)23 pairs of chromosomes.
b)23 chromosomes.
c)46 pairs of chromosomes.
d)2 pairs of sex chromosomes.
e)one pair of autosomes.


a)23 pairs of chromosomes.

Biology & Microbiology

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Why do the Galápagos Islands and the Hawaiian Islands have so many endemic species of flies and birds? Check all that apply.  

_____  There are numerous islands in each archipelago. _____  There is adequate distance between islands to allow divergence. _____  The founder effect was common when islands were colonized. _____  Each bird or fly species has many common ancestors.

Biology & Microbiology

Ossification zone

What will be an ideal response?

Biology & Microbiology

Parsimony analysis offers the advantage of:

a. being a consistent estimator. b. conceptual simplicity. c. ensuring that we get the right answer if given enough data. d. All of the above. e. None of the above.

Biology & Microbiology

Select the correct statement.

A) in humans, meiosis of diploid cells in the ovaries produces haploid female gametes, or eggs B) in humans, mitosis of haploid cells in the testes produces haploid gametes, or sperm C) in plants, diploid cells in the anther undergo meiosis to produce eggs D) in plants, diploid cells in the ovule undergo meiosis to produce diploid gametes E) none of the choices is correct

Biology & Microbiology