Assuming complete dominance, what is the expected ratio of genotypes of the offspring following the cross of two heterozygotes?
A. 1:1
B. 4:1
C. 1:2:1
D. 3:1
Answer: C
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Binary fission within vacuoles divides which of the following forms of Chlamydia?
a. RB b. EB c. Replicate body d. Initial body
In the cultivation of microaerophilic and anaerobic bacteria,
A. a(n) candle/anaerobe jar is sufficient. B. atmospheric oxygen in a(n) candle/anaerobe jar is converted to water. C. a packet containing chemicals that generate carbon dioxide and hydrogen is used in a(n) candle/anaerobic jar. D. oxidizing agents are incorporated into the media that react with oxygen.
After fertilization, the zygote grows through a series of cell divisions called cleavage. The embryo does not grow in size although the cell number is increasing. How does this happen?
What will be an ideal response?
Why do you use only some of the variation of your treatment variable (the component predicted in the first stage) when using an instrumental variable approach?
A. To avoid the heteroscedasticity problem. B. To have the estimate of the treatment effect be based only on variation that is exogenous variation to the other factors affecting the outcome. C. To get smaller standard errors. D. To have the estimate of the treatment effect be based only on variation of the treatment that is correlated with the outcome.