A human fetus that has the genotype XO will be designated female because:
A. female sex is determined by the presence
of a gene on the X chromosome.
B. female sex is determined by the absence
of TDF, a protein produced by a gene on the
fetus's Y chromosome.
C. female sex is determined by only one X
chromosome.
D. female sex is determined by the presence
of TDF, a protein produced by a gene on the
fetus's X chromosome.
B
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The ____________________ of STR alleles reveals how often they are observed in a population
Fill in the blank(s) with correct word
When the photosynthetic organisms evolved the ability to split water, they produced _____ as a waste material, which was poisonous to most of the cells then alive
a. hydrogen gas b. hydrogen sulfide c. water d. carbon dioxide e. oxygen
The human body’s “thermostat” is the hypothalamus
____________________ Indicate whether the statement is true or false.
What are the "seed leaves" that grow from bulges on the embryo called?
A. Ovules B. Embryo sacs C. Radicles D. Cotyledons E. Petioles