Answer:
Directional selection
Explanation:
The type of natural selection that favors one of the extreme phenotypes due to its higher survival and reproductive success is known as directional selection. It shifts the peak of the distribution curve of the phenotype towards one extreme end.
In the given example, the plants with thickest leaves have better survival and reproductive success under the drier climate of their new habitat. This would allow the plants with thickest leaves to survive well and leave more progeny.
After several generations, the population would exhibit an increased frequency of plants with thickest leaves over the plants with intermediate and thinnest leaves.
Since the natural selection has favored one extreme phenotype (thickest leaves) over the average (intermediate thickness) and the other extreme (thinnest leaves) phenotype, it is directional selection.
Answer:
33.3 cM
Explanation:
Parent 1: blue shell, long antenna : BBLL
Parent 2: green shell, short antenna : bbll
BBLL X bbll :
F1 : BbLl ( blue shell, long antenna )
BbLl X bbll :
BL/bl = 82 : Parental
bl/bl = 78 : Parental
Bl/bl = 37 : Recombinant
bL/bl = 43 : Recombinant
Total = 240
Recombination frequency = (Number of recombinants/ Total offspring)*100
= (80/240) * 100 = 33.33 %
Map distance = recombination frequency
Hence, map distance = 33.3 cM
Answer:
Toxin
Explanation:
Toxin usually refers to a substance that is highly poisonous and is directly generated by the organism such as plants and animals within their living cells. These substances can occur in the form of small molecules, or proteins that have the capacity to cause a certain types of diseases when it comes in physical contact with the body tissue or due to the absorption of these substances by the tissues while having the interaction with its biologically larger molecules.
Thus, toxins are considered as a class of poisonous chemicals that are responsible for the damaging of cells and also affect the growth of cells.