There are populations of snails in New Zealand that can produce sexually or asexually. The snails are parasitized by a type of worm, which is a major stressor to the snails. Given what you know about conditions that favor sexual or asexual reproduction, you would expect to see the snails produce asexually when:
a. there are many parasitic worms in the environment
b. there are few parasitic worms in the environment
Ans: b. there are few parasitic worms in the environment
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Imagine that horn color in Hodags (folkloric creatures of Wisconsin) is controlled by a single gene so that when you mate a Hodag homozygous for bright orange horns (COCO) with a Hodag homozygous for ivory horns (CICI), numerous offspring are produced, all with pale orange horns. Now consider that you cross an orange-horned Hodag with an ivory-horned Hodag and get an F1.
A. 9 bright orange: 6 pale orange: 1 ivory B. 1 bright orange: 2 pale orange: 1 ivory C. 3 bright orange: 1 ivory D. 1COCO: 2COCI: 1CICI E. 3COCO: 1CICI Clarify Question
In mitosis, one diploid nucleus becomes
a. two haploid nuclei. b. one haploid nucleus. c. two diploid nuclei. d. four diploid nuclei. e. four haploid nuclei.
Features that contributed to success on land include __________ and __________ (two types of
vascular tissues). Fill in the blank(s) with the appropriate word(s).
When the dentist gives you a shot of Novocain, why to you not feel any pain when s/he drills into your
tooth? a. The neuron remains in the depolarized state. b. A transmembrane potential does not form. c. The drug decreases the external Na+ concentration. d. Voltage-activated K+ channels are blocked. e. Nerve transmission is blocked