. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 110 K. YAMADA AND K. MIHASHI - o. 0 20 40 60 80 100 120 140 160 Duration of incubation in cold (mini Figure 3. Temperature-jump experiment showing the delay in u relative to eontrol in Hemiccntrotiis pulcherrimus eggs as a function of the duration of incubation at low temperature. Each error bar shows the 99% confidence interval of the difference between the average for u, in the temperature-jump sample and the average tor u, in its control, at each of various incubation times (given in the abscissa). The data point for the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 110 K. YAMADA AND K. MIHASHI - o. 0 20 40 60 80 100 120 140 160 Duration of incubation in cold (mini Figure 3. Temperature-jump experiment showing the delay in u relative to eontrol in Hemiccntrotiis pulcherrimus eggs as a function of the duration of incubation at low temperature. Each error bar shows the 99% confidence interval of the difference between the average for u, in the temperature-jump sample and the average tor u, in its control, at each of various incubation times (given in the abscissa). The data point for the longest incubation time is from the measurement in which eggs were incubated at °C throughout; its abscissa value is the mean length of the first cleavage cycle of the eggs. The straight solid line was obtained by applying least-squares fitting to all the data points except the one for the shortest incubation time, using the sum of the squares of the SE of two coupled averages as the variance. The broken lines give the endpoints of the 997r confidence interval for the true mean of the ordinate value for a given abscissa value (Green and Margerison. 1977). The 99% confidence interval for the abscissa intercept of the regression line, which is predicted from the above endpoints (Draper and Smith, 1981). is between and min. Discussion Temperature dependence of the processes affecting the length of cleavage cycles Various processes, acting in sequence or in parallel, make up the cell cycle, but only some of these affect the length of the cycle (Nurse. 1990). The observation of the temperature-independent period immediately after fertil- ization means that there are one or more temperature- independent processes affecting the length of the first cleavage cycle. The cleavage cycles differ in absolute length, and thus they must also differ in the ratio between the duration of the processes governing the length of the cleavage cycles and the total duration of the cycles. Ne
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
