Biology Answers

1. Research Bioremediation as an application of metagenomics, and comment on how this mechanism can be utilized as an environmental management intervention within your community. Here are some videos to get you started:

• Can Microbes Clean Up our Oily Mess
• Researchers Could use Microbes to Clean Mine Sites

if a heterozygus tall plant is crossed with a short plant what would the genotypes and phenotypes of the offspring be

 Tiny openings or pores in plant tissue that allow for gas exchange

Through PCR, we have determined the PER3 genotypes for a class of students as follows:

H4/H4 = 125 individuals; H4/H5 = 90 individuals and H5/H5=85 individuals.

Considering the Hardy Weinberg equilibrium, which is the (correct) null hypothesis tested by Chi-square? Select only one answer.

1.The whole class represents a population that may be in Hardy-Weinberg equilibrium

2.The whole class represents a population that is in Hardy-Weinberg equilibrium

3.The whole class represents a population that may not be in Hardy-Weinberg equilibrium

4.The whole class represents a population that is not in Hardy-Weinberg equilibrium

Through PCR, we have determined the PER3 genotypes for a class of students as follows:

H4/H4 = 125 individuals; H4/H5 = 90 individuals and H5/H5=85 individuals.

Considering the Hardy Weinberg equilibrium and comparing the observed and the expected number of individuals for the three genotypes, calculate the value of the Chi-square statistic. Select only one answer.

1.0.50

2.22.31

3.14.59

4.28.67

5.45.43

6.3.84

7.0.05

Through PCR, we have determined the PER3 genotypes for a class of students as follows:

H4/H4 = 125 individuals; H4/H5 = 90 individuals and H5/H5=85 individuals.

Using the genotype frequencies derived assuming that the class were a population in Hardy-Weinberg equilibrium, calculate the number of H4/H4 individuals that would be expected in the class (rounded numbers). Select only one answer.

1.96

2.129

3.171

4.42

5.147

6.57

7.72

Through PCR, we have determined the PER3 genotypes for a class of students as follows:

H4/H4 = 125 individuals; H4/H5 = 90 individuals and H5/H5=85 individuals.

Using the allele frequencies experimentally derived, calculate the frequency of the H4/H5 genotype that would be expected if the class were a population in Hardy-Weinberg equilibrium. Select only one answer.

1.0.14

2.0.43

3.0.49

4.0.24

5.0.32

6.0.19

7.0.57

Through PCR, we have determined the PER3 genotypes for a class of students as follows:

H4/H4 = 125 individuals; H4/H5 = 90 individuals and H5/H5=85 individuals.

What is the frequency of the H5 allele in the class? Select only one answer.

1.0.19

2.0.49

3.0.14

4.0.24

5.0.57

6.0.32

7.0.43

Through PCR, we have determined the PER3 genotypes for a class of students as follows:

H4/H4 = 125 individuals; H4/H5 = 90 individuals and H5/H5=85 individuals.

How many H4 alleles are in the class? Select only one answer.

1.340

2.215

3.90

4.175

5.85

6.260

7.125

Following a mutagenesis experiment to identify novel genes affecting the circadian clock in Drosophila melanogaster you discover several mutants. You start considering two of those mutants that you call c and d. The two homozygous c/c and d/d are arrhythmic, whereas the two heterozygous C/c and D/d are rhythmic with a 24h period. You make two true-breeding stocks: stock 3 homozygous for c and stock 4 homozygous for d. You cross them in both directions and in both cases you observe complementation with no difference between males and females. Then you take the progeny of one cross, for instance the F1 of Females 3 x Males 4, and you perform a Testcross. Out of 1000 flies resulting from the Testcross only 125 are rhythmic.

Using the number of flies expected for the Parental and the Recombinant genotypes and the formula that defines recombination frequency, what is the recombination frequency between loci C and D?