The genotypic F2 ratio expected in a dihybrid cross is 9:3:3:1
Indicate whether the statement is true or false
FALSE
Explanation: That is the expected phenotypic ratio. The genotypic ratio should be 1:2:1:2:4:2:1:2:1.
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Twitching or gliding motility involves
A. type IV pili. B. movement of slime. C. axial fibrils. D. both type IV pili and movement of slime can be involved in twitching or gliding motility.
Robert Koch developed a vaccine that could be used to prevent anthrax.
Answer the following statement true (T) or false (F)
Initially, which of the following isolating mechanisms is likely to have been the most important in preventing gene flow between the two populations of Rhagoletis?
A) Gamete incompatibility B) Temporal isolation C) Mechanical isolation D) Reduced hybrid viability
Lions and tigers can interbreed and produce offspring called tiglons or ligers, which have normal life spans but are sterile. Lions and tigers remain isolated genetically because of
A) mechanical incompatibility. B) heterozygote disadvantage. C) hybrid infertility. D) hybrid inviability. E) behavioral isolation.