Consider a population of wildflowers in which the frequency of the red allele cr is p = 0.7.

Part A Consider a population of wildflowers in which the frequency of the red allele CRis p = 0.7. What is the frequency of the white allele (CW) in this population?

0
0.3
0.49
0.7
Part B This Punnett square shows allele combinations for all possible genetic crosses in the wildflower population described in Part A.
CR p = 0.7 CW q = 0.3
CR p = 0.7 CRCR ? CRCW?
CW q = 0.3 CRCW ? CWCW ?
What are the expected genotype frequencies in the offspring generation? What are the expected genotype frequencies in the offspring generation?
0.49 CRCR(red flowers), 0.42 CRCW(pink flowers), 0.09 CWCW(white flowers)
0.49 CRCR(red flowers), 0.21 CRCW(pink flowers), 0.30 CWCW(white flowers)
0.09 CRCR(red flowers), 0.21 CRCW(pink flowers), 0.42 CWCW(white flowers)
0.09 CRCR(red flowers), 0.42 CRCW(pink flowers), 0.09 CWCW(white flowers)

Answer

Part A At a locus two alleles are used to measure frequency. If CR is P=0.7, then CW is q Now, p+q=1 Then q= 0.3 Frequency of CW is 0.3 Part B
CR P=0.7 CW q=0.3
CR P=0.7 CRCR P2 CRCW pq
CW q=0.3 CRCW pq CWCW q 2
According to Hardy-Weinberg equilibrium CRCR = p2 = (0.7)^2 = 0.49 CRCW = 2pq = 2(0.7)(0.3) = 0.42 CWCW = q^2 = (0.3)2 = 0.09

0.49 CRCR (red flowers), 0.42 CRCW (pink flowers), 0.09 CWCW (white flowers)

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