Biology Answers

In peas, a gene for tall plants (T) is dominant over its allele for short plants (t). The gene for smooth peas (S) is dominant over its allele for wrinkled peas (s). The genes are not linked. Determine both phenotypic and genotypic ratios for the results of each of the following crosses:

3.1. heterozygous tall heterozygous smooth x heterozygous tall heterozygous smooth.                                                                                          [26 marks]

In a particular species of plant, tall is dominant to short, and orange petals are dominant to the recessive white colour. Use T and t to symbolize the alleles for height, and F and f to symbolize the alleles for flower colour. A homozygous tall white flower is crossed with a flower heterozygous for both traits.

1.1 List the genotypes of the parents.                                           

1.2 What are the F1 GENOTYPIC and PHENOTYPIC ratios?          [5 marks]

1.3 What are the F2 genotypic and phenotypic ratios?   

In a particular species of plant, tall is dominant to short, and orange petals are dominant to the recessive white colour. Use T and t to symbolize the alleles for height, and F and f to symbolize the alleles for flower colour. A homozygous tall white flower is crossed with a flower heterozygous for both traits.

1.1 List the genotypes of the parents.  

1.2 What are the F1 GENOTYPIC and PHENOTYPIC ratios?  

1.3 What are the F2 genotypic and phenotypic ratios? 

which of the following taxa have mitochondrial DNA?

1. What is one advantage of using electron microscopy over the DFA? What is one disadvantage?

1. Complete the table below and then describe what the EM results indicate about what might is causing this disease?

Cell line A

Cell line B

Cell line C

Patient 1

Patient 2

Patient 3

Patient 4

What is Your Conclusion?

Time is running out-- we need your recommendation now! Consider all the results that were presented in this case.

1. What is pathogen causing the Fatal Flu? Explicitly state what you think is causing the outbreak and present evidence that supports your hypothesis. Your argument must refer to your results and
2. include information from the references as needed.

1. Do you think these are conclusive results? What tests would you recommend next to conclusively prove the etiological agent of this outbreak?