Explain why, after the Industrial Revolution in England, dark-coloured pepper moths became more abundant than the usual light-coloured moths, and why this case is often cited as an example of evolution by natural selection.
What will be an ideal response?
Answer: Before the Industrial Revolution, light-coloured pepper moths were prevailing. However, during the Revolution, many tree trunks became darker in colour due to pollution. In this setting, light-coloured moths became easy prey for predators and were mostly exterminated. This is a good example of evolution by natural selection, because dark-coloured moths were left behind to reproduce, and therefore became more abundant.
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Which of the following questions is about gene regulation? Select all correct choices
A. Why do all eukaryotes share a common genetic code? B. Where are genes for hemoglobin expressed? C. How much insulin is produced after a meal?
The Dlx gene encodes a transcription factor that signals clusters of embryonic cells to ____ and gives rise to an
appendage. a. fold into the cardiac muscle b. protrude from the body c. form reproductive structures d. induce apoptosis in cells lining the appendages e. develop into the immune system
Which figure, A, B, C, depicts the type of specialized excretory tubule system called the metanephridium?
1.A
2.B
3.C
What type of cells are joined end-to-end, conduct water and are connected to each other with strips of wall material?
A. tracheids B. vessel members C. sieve cells D. sieve tube members E. companion cells