Answer:
In heterozygotic individuals, the gene for sickle cell anemia is protective against malaria.
Explanation:
Through the same mechanism that the mutation associated with sickle cell anemia produces the disease (altered hemoglobin structure), having a single copy of the mutation (that is, being heterozygotic) provides protection against malaria. This is believed to be due to the altered structure causing difficulty for the malaria parasite when it attempts to enter red blood cells as part of its life cycle.
Today, there are medications to successfully treat malaria, but it still killed 627,000 people in 2020. This represents a significant evolutionary pressure for genes that would prevent serious malarial illnesses. As malaria was and still is common in African regions, the result was a higher prevalence of sickle cell anemia in those of African descent.
Because we control them both in the same direction so if we where like some lizards that move each eye individually then we would see two images
The shedding of the endometrium occurs during ovulation resulting from a decrease in progesterone
Answer:
The relationships include symbiosis, predation and competition.
Explanation:
Organisms relate with each other in different ways in the environment. Such relationships include:
Competition: This deals with the struggle between organisms for food and other available resources. The strongest and fittest usually have a higher chance of survival.
Predation: This is the process by which bigger animals prey on smaller animals for food. This helps in movement of energy in the trophic levels and also the balancing of the eco system.
Symbiosis: This is a mutual relationship in which two organisms form a type of partnership and benefit positively from each other.
Since ALD is an x-linked recessive disease, women must have 2 affected x chromosomes in order to get the disease, which is unlikely because the disease is rare. Since men only have one x chromosome, they will have the disease if they inherit an affected x chromosome.