Question

Consider a population of wildflowers in which the frequency of the red allele cr is p = 0.7. what is the frequency of the white allele (cw ) in this population? what is the frequency of the white allele (cw ) in this population? 0 0.3 0.49 0.7 submitrequest answer part b this punnett square shows allele combinations for all possible genetic crosses in the wildflower population described in p

Answer 1

I) Alleles is the alternative form of a gene or in other terms the variant form of a gene. If there are two alleles at a locus p and q are used to represent their frequencies. Frequencies of all alleles in a population will add up to 1. 
Therefore, in this case if red allele CW is p=0.7, then the frequency of the white allele in this population (q) is 0.3.

ii) From the punnet square the expected genotypes frequencies in the offspring generation will be 0.49 CRCR (red flowers, o.42 CRCW (pink flowers) and 0.09 CWCW (white flowers). 

Answer 2

The total frequency of the red allele and the white allele in decimals or fraction adds up to 1. Here the frequency of red allele(cr) is p=0.7 and we need to determine the frequency of white allele (cw) which is q in the population.

$p+q=1\\0.7+q=1\\q=1-(0.7)\\q=0.3$

The punnett square shows the probability of each genotype and corresponding phenotype.

The white allele has genotype : cw

The red allele has genotype : cr

The punnett square cross is as below:-

according to Hardy Wienberg equilibrium:

$p^{2}=0.7^{2} \\=0.49\\q^{2} =(0.3)^{2}= 0.09\\2pq=2*0.7*0.3=0.42$

The phenotype of offspring will be 0.49 red flowers, 0.42 pink flowers and 0.09 red flowers.