Answer:
The correct answer is: The limited variability in the size of shells in the initiating population.
Explanation:
- The shell size in snail species is determined by a number of variants (alleles) of the gene that is responsible for determining the size of their shell.
- The number of variants of the gene encoding for shell size is limited.
- However, the different variants may encode for different shell size, say from 5 millimetre to 20 millimetre.
- All these variants are present in the original population of snail but in different proportions.
- However, if predation tend to target the snail species with smaller shell size (5 millimetre to 10 millimetre) then evolution would tend to increase the frequency of snails having the larger shell variants (15 millimetre to 20 millimetre).
- This will result in a population of snails with increased shell size.
- However, an increase in shell size over 20 millimetre is not possible because no allelic variants encoding for a shell size greater than 20 millimetre is available in the population.
<h3><u>Answer;</u></h3>
Gene
<h3><u>Explanation;</u></h3>
- <em><u>A gene is a functional unit of a DNA molecule, it is a segment of DNA that contains the information that is used to generate proteins. </u></em>Each gene codes for a particular protein or in other words is used to produce a specific protein via the processes of transcription and translation.
- <em><u>By coding for a given protein, gene determines the traits or characteristics of an individual.</u></em> During the process of transcription, a process catalyzed by enzyme RNA polymerase, a gene is use to generate a messenger RNA, which then undergoes the process of translation in the cytoplasm to form proteins.
Answer:
When the humidity is high, moisture/water becomes easier to evaporate, making the clouds heavier, thus the chances of precipitation are higher.