Unity and Diversity A.8 Evolution and Speciation (id: c6a2b6495)

本题目来源于试卷: Unity and Diversity A.8 Evolution and Speciation，类别为 IB生物学

[问答题]
A study has been conda w;:mm b,a-z.xrx agk7r l;z7ucted on the effect of hormonal contraception lat0mf ;pv7 h8 wx* +y;kbz)hqpollution on the mating calls of the adult male African clawed frog (Xenopus laevis). The spectrogram shows the frequency and volume of clicks (mating call) of control X.laevis and those exposed to oestrogh;);q lmxv p0 aybh8kfwz*7+ten.


1.Distinguish between the clicks in the spectrogram between the control X. laevis and the X. laevis treated with oestrogen in 1 second.

The graph shows the average duration of the X. laevis mating calls when exposed to the hormone oestrogen.


2.Describe the effect of oestrogen on the duration of the mating call.

3.Explain why it is important to have the X.laevis control group.

4.Identify the independent variable in this study.

5.1.Predict the reproductive success of X.laevis exposed to 29.6 ng/L of oestrogen.
5.2.Outline the possible consequences of oestrogen exposure on X. laevis.

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