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Answer:
Median height is selected
Explanation:
Stabilizing selection is a particular type of natural selection where the mean of the trait in the population stabilizes on non-extreme phenotypes, thereby favoring intermediate phenotypic variants. At genetic level, stabilizing selection is shaped by selective forces that push the distribution of the trait in the population toward the average (median trait), it is a condition that may happen when a population is completely adapted to its environment. Thus, stabilizing selection acts to purge the extreme phenotypic variants via purifying selection. Stabilizing selection is considered to be one of the most important mechanisms controlling the distribution of different phenotypes after many cycles of artificial selection, it s for that reason that breeders believe that this type of natural selection is the most common in nature.
Answer:
9/16
Explanation:
Let broad, straight wings be represented by the allele W. Homozygous condition will be WW or ww while heterozygous condition will be Ww
Let pale-colored body with dark transverse stripes is represented by C. Homozygous condition will be CC or cc while heterozygous condition will be Cc.
Heterozygous condition for both trait will be WwCc. Hence a mating between two flies that are heterozygous for both trait will be;
WwCc x WwCc
This will yield offspring in the following phenotypic ratio;
Broad, straight wings with pale-colored body/dark transverse stripes - 9/16
Broad, straight wings with ebony body colour - 3/16
Nubby, vestigial wings with pale-colored body/dark transverse stripes - 3/16
Nubby, vestigial wings with ebony body colour - 1/16.
See the attached image for the Punnet square result of the cross.
The proportion is 9/16
Based on the mutation rate of the molecular clock, it will take 22.5 million years for one full base pair mutation to occur.
<h3>What is a molecular clock?</h3>
A molecular clock is a biomolecule which is chosen to serve as a clock due to its periodical changes in a regular pattern.
Mutation in genes can serve as molecular clock.
The mutation in the gene of coding for the venom mutates at a rate of 0.76 base pairs every 17.1 million years.
It will take 17.1/0.76 = 22.5 million years for 1 base pair to mutate.
Therefore, it will take 22.5 million years for one full base pair mutation to occur.
Learn more about molecular clock at: brainly.com/question/1146586
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