Let’s say you are studying a population of Japanese four o’clock plants. In thes
ID: 65207 • Letter: L
Question
Let’s say you are studying a population of Japanese four o’clock plants. In these plants, the allele for red color flower shows incomplete dominance over the allele for white flowers. This is very convenient for this experiment because you can distinguish the heterozygous (pink flowers) from the homozygous dominant (red flowers). For your experiment, you produced a large number of plants, 25% had red flowers, 25% had white flowers and 50% had pink flowers. You transplanted them into different habitats and left some in the lab (using the same proportions in all the habitats). You waited a few years, while plants reproduce for a few generations and then you go back and resample the populations you’ve transplanted.
5. In the lab you ensured that all individuals receive all requirements to grow and reproduce and mate randomly. A) What do you expect the distribution of the phenotypes after a few generations breeding in the lab? B) Is the lab population in Hardy-Weinberg equilibrium? Yes/No, explain
6. In habitat A, you find that you only have red flowering plants and white flowering plants but there are no pink flowering plants. A) Is the population in habitat A in Hardy-Weinberg equilibrium? Yes/No, explain. B) Which one(s) of the five agents of evolutionary change could be responsible for these results? Explain. C) What type(s) of selection (stabilizing, disruptive, directional, oscillating, etc...) could be responsible for the results in habitat A? Explain
Explanation / Answer
Answer:
5a) After few generation also the low of incomplete dominace will be persising and we will obtain offspring like red,pink and white.
b)Suppose after few generation The population consists of 77 red flowered individuals, 144 pink flowered individuals, 34 white flower individuals according to Hardy-Weinberg Principle the frequencies are:-
To find the genotype frequencies, just divide the individuals of a particular color by the total number of individuals.
Red (homozygous dominant): 77/255 = .30
Pink (heterozygous): 144/255 = .56
White (homozygous recessive): 34/255 = .13
To get the allele frequencies, find q by taking the square root of the recessive genotype frequency (which is q²). This gives you .37. From here you can get the frequency of the dominant allele p because 1 - q = p. Thus, the frequency of the dominant allele is .63. so it follows the Hardy Weinberg Principle.
6a) The populationin Habitat A is not following Hardy-Weinberg equilibrium because allof the allele are not present only red and white flowers are present.Wchich implies that only Homozygous alleles are present not the Heterozygous.This is because of Gene flow because the proportion of allele changes time to time.
b) Gene Flow is the one of five agents of evolutionary change could be responsible for these tye of result.
c) Oscillating type selectioncould be responsile for the result in Habitat A.
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