A new plant species B forms by autopolyploidy from specie

Autopolyploidy Allopolyploidy & Hardy-Weinberg Equilibrium Exercises

1. A. A new plant species B forms by autopolyploidy from species A, which has a chromosome number of 2n = 10. Assuming that the cell’s chromosome number was doubled from the diploid number (2n) to a tetraploid number (4n), how many chromosomes would species B have? ____________

B. To explain the process that generated the tetraploid cell of problem #1 implement the following guidelines

· draw a series of diagrams that represent a cell going through the process of cell division

· label each one of these cells with the number of chromosomes it contains

· indicate where a meiotic error took place.

2. If species A in problem # 1 were to hybridize by allopolyploidy with species C (2n = 14) and produce a new, fertile species, D, how many chromosomes would species D have? Use the following guidelines to answer the question:

· Draw a series of diagrams to describe the process of allopoliploidy. Each diagram should depict a cell going through the meiotic process

· label each cell with the number of chromosomes it contains

· indicate where a meiotic error(s) took place.

3. In a Hardy-Weinberg population with two alleles, B and b, that are in equilibrium, the frequency of the allele b is 0.4. What is the percentage of the population that is homozygous for this allele? Explain your answer. ______

4. In a Hardy-Weinberg population with two alleles, B and b, that are in equilibrium, the frequency of allele b is 0.1. What is the percentage of the population that is heterozygous for this allele? Explain your answer. ______

5. Assuming that cystic fibrosis is a disorder in Hardy-Weinberg Equilibrium and that the frequency of individuals born with cystic fibrosis in a ficticious country is approximately 2/1000, calculate the frequency of carriers for the disorder. Note that cystic fibrosis is a disorder that results from homozygosity at a recessive allele.