Sample Exam Questions The R (resistance) gene in plants is frequently found conf

Question

Sample Exam Questions The R (resistance) gene in plants is frequently found conferring resistance against bacterial and fungal infections. You are the chief research officer (CRO) in a startup biotech company tasked with developing a novel flowering annual plant that has not been in the consumer market before. To reduce pesticide use, you intend to develop a disease-resistant clone through an artificial selection protocol. From literature search, you know that there are two resistance alleles, R and r, in this species. From the field samples, you determined that the allele frequencies for R and r are 0.2 and 0.8, respectively. You then collected random 1,000 seeds from the field and proceed to conduct your artificial selection experiment. Please answer Questions 14 to 17 Assuming that this flowering plant is pollinated by wind, therefore the fertilization is random. Of the 1,000 seeds, how many do you expect to have the Rr genotype? 14. 0.16 0.20 0.32 0.64 0.80 15. While the seeds are germinating, you applied a fungal pathogen to the soil to challenge these emerging seedlings. You found that 40% of the RR individuals have extremely stunted growth, so much so that no flowers were developed from these stunted individuals. You also found that 80% of the rr seedlings were killed by fungal infection. Of the Rr individuals, 80% grew to be fully matured plants. Given the result, what is the average survival rate among those initial 1,000 seeds that became a fully grown flowering plant? 0.408 0.467 0.533 0.667 0.800 16. Following up on Question 15, what is the expected number of seeds, out of 1,000, in the next generation that have the Rr genotype? 139 373 394 467 628 17. Following up on Question 15, this is an example of (A) selection for a dominant allele (C)selection against a recessive lethal allele (D) egative frequency-dependent selection None of the above

Explanation / Answer

14) Expected Rr genotype:

C) 0.32

15) A fully grown flowering plant:

A) 0.408

16) In the next generation, that have Rr genotype:

D) 467 (This is in F2 generation)

17) This is an example of:

B) Overdominance

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