A vasectomy involves cutting the _____________, which is probably easier to do in humans than it might have been because it evolved to be much __________ than it "needs" to be.
Fill in the blank(s) with the appropriate word(s).
Answer: vas deferens, longer
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Which type of tissue constitutes most of the wood of a tree trunk?
A. dermal tissue B. parenchyma tissue C. collenchyma tissue D. sclerenchyma tissue E. vascular tissue
Gene amplification involves:a
increasing the affinity of a gene to DNA polymerase. b. extra replication of genes that specify a certain gene product only in cells needing this product. c. improving the accuracy by which a gene is copied to produce an mRNA molecule. d. enhancing the activity of RNA polymerase. e. increasing the size of the gene that encodes a needed protein.
What is the main driving force of surface currents?
a. Coriolis Effect b. Centripetal force c. Trade winds d. Gyres
You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ l+ b+ b+) and (l+ l- b+ b-) flies are normal, but ( l- l- b- b-) flies don't move around very much and cannot detect the location of a light source. You perform a testcross and get the following results:
listless, sighted 100 listless, blind 400 normal activity, sighted 400 normal activity, blind 100 What is the distance between these two genes on the chromosome? A. They are on different chromosomes. B. They are 10 map units apart. C. They are 20 map units apart. D. They are 40 map units apart. E. They are 80 map units apart.