D. Lack of sunlight
Explanation:
In a forest, an example of a limiting factor is that lack of sunlight.
Limiting factors in an ecosystems are the that factors usually made up of environment resources that affects the growth and abundance of organisms in an ecosystem.
- Examples are sunlight, water, nutrient, air etc
- In a forest, sunlight is one of the limiting factors.
- Forest vegetation are stratified.
- The broad leaved canopy trees dominates and receives the bulk of the sunlight.
- The undergrowth beneath competes for the little sunlight that reaches below for their own use.
- Distributions of sunlight in an ecosystem affects the way in which vegetation are dispersed.
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Answer:
Sickle cell anemia refers to a recessive inheritance disorder, in which every individual carries two copies of a gene. In normal individuals, both the copies of the globin gene are normal, and they generate 2 and 4 kb fragments of DNA on digestion by BseR1. A patient with sickle cell anemia is homozygous for the recessive gene and exhibits a mutation in both the copies of a globin gene.
Therefore, BseR1 could not digest the globin gene and generate a single 6Kb fragment of DNA. In a patient acting as a carrier, one copy of a globin gene is mutated and the other is normal. As a consequence, BseR1 digestion generates 6kb of the fragment of DNA (mutated copy) and 4 and 2 kb from the normal copy of a gene.