Which of these is required for natural selection to occur?
A) inheritance
B) unequal reproductive success
C) individual variation
D) all of the above
D
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You are a doctor examining a patient whose thymus never developed because of a medical condition called DiGeorge syndrome. You know that this medical condition is usually due to the deletion of a section of chromosome #22
The karyotype of this patient shows one copy of chromosome #22 that is of normal length and one copy that is shortened. This indicates that the genotype of this patient is _______________ and that the expression of this trait is _____________. A. Homozygous dominant; dominant B. Heterozygous; dominant C. Heterozygous; recessive D. Homozygous recessive; recessive
Which type of chromosome has the shortest p arm of the chromosome?
A. Acrocentic B. Metacentric C. Telocentric D. Submetacentric
The secretions of exocrine glands
A. directly enter the circulatory system. B. are stimulated by nerve cells. C. are always emptied onto the body surface. D. are rarely under hormonal control.
The genus Arthrobacter ________.
A. is a significant component of the microbial flora of soil and plays an important role in the degradation of some herbicides and pesticides B. is a significant component of the microbial flora of soil C. forms heat-resistant endospores D. plays an important role in the degradation of some herbicides and pesticides