Maren Blohm, intrepid explorer and naturalist, found an isolated valley with a p

Question

Maren Blohm, intrepid explorer and naturalist, found an isolated valley with a population of desert mallows in it. In a random sample of plants, she counted 360 red-flowered and 490 white-flowered plants. Later, she determined that flower color is controlled by a single gene with red (R) completely dominant over white (r). If the population is mating randomly:

a. What is the frequency of

i. R?

ii. r?

b. What proportion of the plants should be heterozygous?

c. If the plants continue mating randomly what will be the frequency of the three genotypes in the next generation?

d. What is the probability that a red plant picked at random will breed true for flower color (i.e. be homozygous)?

I have worked all parts a-c, and then I drew a blank once I got to d

Explanation / Answer

a)

R=.24

r =.76

b) proportion of plants to be heterozygous =.36

c) RR-----.06

rr----------0.58

Rr------0.36

red =42%

white =58%

d) the frequency of homozygous dominant (RR) divided by the frequency of red flowers. freq. RR/ freq. Red = 0.06/0.423 = 0.14

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