In Drosophila, sex is determined by a balance between the number of haploid sets of autosomes and the number of ________

A) satellited chromosomes
B) Y chromosomes
C) X chromosomes
D) chromomeres
E) centromeres


C

Biology & Microbiology

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Mutants that are lacIS do not produce lac enzymes, regardless of the presence or absence of lactose

Indicate whether the statement is true or false

Biology & Microbiology

Accommodation enabling us to switch from focusing on something nearby to something more distant is accomplished by the ________ muscle

Fill in the blank(s) with correct word

Biology & Microbiology

Frequently, a group of related species will each have a unique courtship ritual that must be performed correctly for both partners to be willing to mate. Such a ritual constitutes a ________ and ________ reproductive barrier

A) mechanical; postzygotic B) behavioral; prezygotic C) temporal; prezygotic D) gametic; postzygotic

Biology & Microbiology

Dead leaf tissue on plants is a condition called:

A. necrosis B. hyperpigmentation C. viral mosaicism D. leaf injury E. none of the above

Biology & Microbiology