Which segment gene is activated first in the Drosophila embryo?
A. pair-rule genes
B. segment-polarity genes
C. gap genes
D. myogenic bHLH genes
C
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A trait that is adaptive in one context and later turns out to have adaptive value in a different context is called ____
a. paedomorphic b. heterochronic c. allometric d. an exaptation e. endemic
Which organisms are not found in the crust of the desert soil? a. Fungi b. Lichens c. All are found in the crust
d. Mosses e. Cyanobacteria
Trisomy 21 or Down syndrome occurs when there is a normal diploid chromosomal complement of 46 chromosomes plus one (extra) chromosome 21. Such individuals therefore have 47 chromosomes
Assume that a mating occurs between a female with Down syndrome and a normal 46-chromosome male. What proportion of the offspring would be expected to have Down syndrome? Justify your answer.
RuBisCO is the key enzyme for carbon fixation because it:
What will be an ideal response?