Groups of organisms that cannot be distinguished morphologically but have no gene flow between them, and are indeed evolutionary independent units, are known as ________ species
Fill in the blank(s) with correct word
cryptic
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Although mutation is the original source of genetic variation, its influence on changing allelic frequencies is relatively minor
Indicate whether the statement is true or false
What is the shape of cocci?
A. Linear B. Tubular C. Oval D. Spherical E. Spring-like
The syndrome known as AIDS is characterized
A) by the presence of HIV. B) as an opportunistic disease resulting from herpesvirus reactivation. C) by CTL attack on CD4 T cells. D) by one or more opportunistic diseases and the presence of HIV. E) by the presence of anti-HIV antibodies.
Indicate which of the following is true with regard to recessive alleles. (Select all that apply)
a. Their expression is masked int he presence of a dominant allele. b. They are expressed only when present on both of the homologous chromosome. c. They are more frequently observed in males than females. d. They are more frequently expressed than other traits. e. They mask the expression of other alleles.