Based on the data in the figure, which is a likely reason for speciation between these two sympatric species of frogs?
a. allopolyploidy
b. habitat isolation
c. hybrid inviability
d. temporal isolation
e. mechanical isolation
d
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Each of the following is considered a part of the body's second line of defense except:
A) fever. B) inflammation. C) interferons. D) lysozyme.
Antiviral drugs are frequently used for the treatment of infectious mononucleosis.
Answer the following statement true (T) or false (F)
Assume a double crossover occurs in this pair of chromosomes that results in chromatids of the genotypes A b C and a B c. If the first crossover (the one between A and B) involves chromatids 1 (A B C) & 4 (a b c), which chromatids could be involved in the second crossover?
Consider a pair of homologous chromosomes heterozygous for three genes (e.g. A B C / a b c) during prophase I of meiosis. Let the sister chromatids of one homolog be numbered 1 and 2; and the sister chromatids of the other homolog be numbered 3 and 4. A) 1 & 2 B) 3 & 4 C) 1 & 3 D) 2 & 4 E) 1 & 4 F) 2 & 3
Can environmental factors affect the expression of certain traits?
What will be an ideal response?