Answer:
Directional selection
Explanation:
Directional selection is a type of natural selection that favors one extreme phenotype of a genetic trait due to its survival and reproductive advantage to the individuals over another extreme phenotype and the intermediate phenotype.
In the given example, the thick-leaved plants are better adapted to a drier climate due to reduced water loss. Directional selection favored the plants with thick leaves which in turn produced more progeny. Over the generations, the population evolved into the one having more number of thick-leaved plants.
Given:
Allele for green pod colour = Gg (Heterozygous)
Allele for Yellow pod colour = gg (Homozygous)
Explanation:
Parents: Gg x gg
When this two parent are crossed, it leads to the following F1 generation (off springs):
<em>• Gg (green colour pod)
</em>
<em>• Gg (Green colour pod)
</em>
<em>• gg (Yellow colour pod)
</em>
<em>• gg (Yellow colour pod)
</em>
Form the produced offspring it can be inferred that the allele combination for green colour pod is Gg. Among the four off springs obtained 2/4 are green colour pod and 2/4 are yellow colour pod.
Answer:
a) During metaphase, each of the 46 chromosomes line up along the center of the cell at the metaphase plate.
