Sickle cell anemia is produced by a genetic defect in the amino acid sequence of hemoglobin. Persons who are homozygous for this allele have abnormal red blood cells, which characterize the disease. The blood cells of heterozygous persons appear normal and they are considered carriers. A test reveals that a man is heterozygous for the sickle cell allele but his wife is homozygous normal.
What is the probability of their children will be carriers of the disease allele?

The probability is 1/2

Explanation:

Heterozygous for sickle cell allele is AS

Homozygous allele is SS

AS SS

The offspring formed include

AS, AS, SS, SS

The probability of their children being carriers include

Number of AS/ Total number of offspring

= 2/4 =1/2 or 0.5

hello there the answer is d

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.