Fisher's sex ratio model predicts a 1:1 female:male sex ratio. Why has this sort of system evolved?
What will be an ideal response?
ANS:
Answers will vary, but could include mention of chromosomal sex determination in mammals; elements of Fisher's model; and/or Hamilton's summary of Fisher's conceptual argument (see Section 1.2 in the text for both).
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If the data-generating process you are working with has a population parameter that is not identified it will be the case that:
A. a fixed effect model will be required. B. you will always need an instrumental variable to get an unbiased estimate. C. you will need more data to get a precise estimate. D. None of the answers is correct.
Which of the following statements regarding the G1 (first gap) phase of the eukaryotic cell cycle is NOT true?
A. If DNA is heavily damaged, checkpoint proteins will delay the cell cycle; the damage will either be fixed or cell division will be permanently stopped. B. Most cells spend the majority of their lives in the G1 phase of the cell cycle. C. Cells that are terminally differentiated and will not divide mitotically might exit the G1 phase and enter the G0 phase. D. The G1 phase is only part of interphase. E. If environmental conditions are favorable during the G1 phase, G1 cyclins are degraded causing the cell to prepare to replicate its DNA.
On what basis does forensic biotechnology distinguish one individual from another?
A) A small tandem repeat in one person will be in a different location in the genome of another person. B) Different people will have completely different genomes. C) Different people will have a different number of tandem repeats at the same location in their genomes. D) Different people will have different mutations in their short tandem repeats.