Two species interbreed occasionally and produce vigorous, fertile hybrids. When the hybrids breed with each other or with either parent species, however, the offspring are feeble or sterile. These species are affected by
A) gametic isolation.
B) reduced hybrid fertility.
C) reduced hybrid viability.
D) hybrid breakdown.
Answer: D
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The sunflower species Helianthus anomalus is thought to have been formed by hybridization between the sunflower species H. petiolaris and H. annuus because it contains a set of chromsomes from both parental species. H. anomalus is most likely an example of instantaneous speciation through
A. allopolyploidy. B. autopolyploidy. C. parthenogenesis. D. hybrid sterility. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about speciation through polyploidy? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The synthesis of the daughter strand of DNA occurs away from the replication fork in the leading strand
Indicate whether the statement is true or false
If a diploid organism has a genome consisting of 4 chromosomes, it can produce ____ different combinations of chromosomes (disregarding crossing over)
a. 4 b. 8 c. 12 d. 16 e. 64
A(n) _______ cross involves two different genes, each affecting a different character.
A: monohybrid B: dihybrid C: trihybrid D: F1 E: F2