Natural selection selects for or against certain

A) alleles. B) phenotypes. C) populations. D) genotypes. E) gene pools.


B

Biology & Microbiology

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Many clinical microbiology laboratories and public health laboratories use techniques such as microbial staining, microbial growth, enzymatic testing, fermentation testing, and microscopic analysis to identify pathogens in samples.  Which categories of classical characteristics for taxonomy are represented here?  (Check all that apply.)

A. Morphological characteristics B. Molecular characteristics C. Physiological and metabolic characteristics D. Biochemical characteristics

Biology & Microbiology

Which of the examples below are polymorphic traits? Select all that apply.

_____ Hair loss in malnourished, captive chimpanzees. _____ A population of lilies that contains equal proportions of both blue and white flowering individuals. _____ The A, B, and O blood types found in humans. _____ Lactose tolerance and intolerance in humans. _____ The change from white coat in winter to brown coat in summer in Arctic fox populations.

Biology & Microbiology

Nitrifying bacteria are important in the conversion of nitrogen gas to usable forms of nitrogen

Indicate whether the statement is true or false

Biology & Microbiology

What is the genetic consequence of a homozygous translocation?

A) Inviable gamete formation (semisterility) B) Gene duplications and deletions C) Formation of abnormal chromatids following crossing-over D) Abnormal pairing during meiosis E) An alteration in the linkage relationships of genes

Biology & Microbiology