In Drosophila melanogaster there is a sex-linked gene for eye color that is found only on the X
chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw).
You examine a vial of 100 flies that are all offspring from a single genetic cross. You see only redeyed
females present, but you see both red-eyed and white-eyed males present. The genotypes of the
parents were
a. Xw+Xw+; Xw+Y.
b. XwXw; Xw+Y.
c. Xw+Xw; XwY.
d. Xw+Xw; Xw+Y.
e. XwXw; XwY.
D
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Which of the following relationships best depicts the amount of carbon stored in the atmosphere, sedimentary rocks, living organisms, and soil?
A. soil < the atmosphere < sedimentary rocks < living organisms B. the atmosphere < soil < living organisms < sedimentary rocks C. sedimentary rocks < soil < living organisms < the atmosphere D. soil < living organisms < sedimentary rocks < the atmosphere E. living organisms < the atmosphere < soil < sedimentary rocks
Fluid that collects in tissues is returned to the bloodstream by the
A. lymphatic system. B. digestive system. C. excretory system. D. endocrine system. E. vascular system.
How is an inoculating loop or needle sterilized prior to use?
What will be an ideal response?
These are examples of:
a. homeobox genes. c. evo–devo. b. ontogeny. d. homeotic transformations.