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slamgirl [31]
3 years ago
9

Sicle cell disease (SCD) is found in numerous populations whose ancestral homes are in the malaria belt of Africa and Asia. SCD

is an autosomal recessive disorder that results from homozygosity for a mutant β-globin gene allele. Data on one affected population indicates that approximately 8 in 100 newborn infants have SCD.Epidemiologic data on this population reveal that before the application of modern medical treatment, natural selection played a major role in shaping the frequencies of alleles. Heterozygous individuals have the highest relative fitness, and in comparison to heterozygotes, those who are βAβA have a relative fitness of 89 percent, but only about 43 percent of those with SCD survived to reproduce. What is the frequency of the wild-type (beta A) allele in this population? Express your answer using two decimal places. What is the frequency of the mutant (beta 8) allele in this population? Express your answer using two decimal places. What is the frequency of carriers of SCD in the population? Express your answer using two decimal places.
Biology
1 answer:
user100 [1]3 years ago
6 0

Answer:

j

Explanation:

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Explanation

The iris is the name by which the colored part of the eye is known, it is located between the cornea and the lens. In the central part of the iris, there is a round opening known as the pupil. The relationship between these two parts of the eye is very important to sight because between them they control the amount of light that enters the eye. This occurs when the eye is exposed to a high amount of light, the iris muscles make the pupil smaller and the iris larger, limiting light entry into the eye. When the eye is exposed to low amounts of light or darkness, the iris becomes smaller and the pupil enlarges, allowing more light to enter. According to the above, the correct answer is B. the iris would get smaller, the pupil would get bigger. Because it describes the behavior of the iris and the pupil when going from a bright room to a dark room.

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