Q4.17. Which of the following statements about thresholds and abrupt climate change is false? 1There are thresholds in the climate system that, once crossed, can produce large, rapid changes.
2Positive feedbacks that amplify the effects of small changes can produce abrupt climate change.
3Climate proxies have recorded multiple examples of abrupt climate change in the past.
4Climatologists predict that reversing the effects of "tipping points" will usually occur rather quickly.

Suppose a particular species of tulip plant has three alleles for the gene that codes for flower color. the cr allele produces red tulips, the cp allele produces purple tulips, and the cw allele produces white tulips. cr is dominant over cp and cw, and cp is dominant over cw. for each of the following crosses, determine the expected ratio of offspring for each flower color. cr cp x cp cw cr cw x cp cw 1 red: 1 purple : 0 white, 1 red: 2 purple: 1 white, 2 red: 1 purple 1 white, 1 red: 3 purple : 0 white, 2 red: 0 purple : 2 white, 2 red: 2 purple : 0 white