Suppose you have a population of mosquitoes that varies in the presence of a recessive allele for resistance to ddt. the frequency of individuals that are resistant (rr) is 0.22. those who are not resistant have either the homozygous dominant genotype (rr), and are found in the population with a frequency of 0.36, or are heterozygous (rr) with a frequency of 0.42. what is the frequency of the r allele in the population? a. 0.22b. 0.11c. 0.65d. 0.43

Option D ,

Explanation:

Given -

Frequency of individuals that are resistant (rr) is represented as ""

Frequency of individual that are not resistant with homozygous dominant genotype (RR) is represented as ""

Frequency of individual that are not resistant with heterozygous (Rr) genotype is represented as ""

As per Hardy Weinberg equation , at equilibrium-

Thus, the given population follow hardy Weinberg equilibrium.

Thus, frequency of the r allele in the population is equal to

The nearest value to this frequency is option D

Hence option D is correct.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.