Question

The frequency of a dominant allele r in a population is 0.4. what is the frequency of the recessive allele, r? 0.3

Answer 1

 If the population is in Hardy-Weinberg equilibrium (the genetic variation in a population will remain constant through the generation in the absence of disturbing factors) then p2+2pq+q2=1 or p+q=1
 p is the frequency of allele (dominant)
q is the frequency of allele (recessive)
 p2 is the frequency of dominant homozygous genotype
2pq is the frequency of heterozygous
q2 is the frequency of recessive homozygous genotype If p=0.4 then q=0.6

Answer 2

Answer:

• The frequency of the recessive allele (r) is 0.6 ,

• Frequency of dominant allele R  (p) +  freq. of recessive allele r (q) = 1

• if the frequency of allele R is 0.4 , so freq. of allele r is 0.6

Explanation:

Alleles:

• An allele  is a version of a gene, a heritable unit that controls a specific feature of an organism.
• For example, Mendel studied a gene that controls flower color in pea plants.
• This gene comes in:  a white allele,w and a purple allele,W
• w: recessive allele   but  W: is dominant allele
• Each pea plant has two gene copies , which may be the same or different alleles, ex; (WW\ Ww\ ww)  ( see first picture)  
• If the two gene copies is:

                    WW: this mean pea plant will take purple color

                    Ww: the dominant purple allele,W,  will hide the  recessive                

                             white allele, w,and    pea plant will be purple.

                     ww: pea plant will be white

Allele frequency :

• Refers to how frequently a particular allele appears in a population

(A population is a group of organisms of the same species that are found in the same area )

• For example : if all the alleles in a population of pea plants were purple alleles, W, the allele frequency of W would be 100%, or 1 However, if half the alleles were W and half were w, each allele would have an allele frequency of 50%, or 0.5

• $frequency of allele W =\frac{Number of allele copies W in population}{Total number of allele copies W and w in population}$

Example: Finding allele frequency: ( see second picture)

• Let’s look at an example ( pic. 2)  Consider the very small population of nine pea plants . Each pea plant has two copies of the flower color gene.  

• If we look at the two gene copies in each plant  ( pic 2 ) and count up how many W copies are present, we find there are 13. If we count up how many w copies are present, we find that there are five. The total number of gene copies in the whole population is 13 + 5 = 18 .

• We can divide the number of copies of each allele by the total number of copies to get the allele frequency.
• When there are just two alleles for a gene in a population, their frequencies are given the symbols (p) and (q) :

• $freq. of allele W (p) =\frac{13}{18}= 0.72$

• $freq of allele w (q) =\frac{5}{18} =0.28$

• The frequencies of all the alleles of a gene must add up to one             ( p+q=1).

Learn more about :

Allele : https://brainly.in/question/1222886

Genes: https://brainly.in/question/7808593

Heredity:https://brainly.in/question/1842175

Keyword:

Allele\ gene\ frecuency \ mendel \ genetics \heredity

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