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:

3.2. homozygous tall wrinkled x short heterozygous smooth.                 [26 marks]

Malignant tumors are sometimes treated with drugs that halt mitosis, and thus stop the production of new cancer cells. Two such drugs, vincristine sulfate and vinblastine sulfate, interfere with the formation of spindle fibers. How could this action halt mitosis? Antibiotics such as mitomycin C and inorganic compounds such as cis-platinum also can be used to stop the growth of tumors. These drugs interfere with DNA synthesis in treated cells. How could this action halt mitosis?

These drugs interfere with DNA synthesis in treated cells. How could this action halt mitosis?

Viruses that cause disease in humans can be completely eradicated even if it uses vectors other than humans.

Select one:

True or False

The “small pox virus” is the only viral disease of humans that has been successfully eradicated.

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True or False

The “small pox virus” is the only viral disease of humans that has been successfully eradicated.

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True or False

Astrazenneca vaccine can cause changes in the human DNA.

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True or False

Pfizer vaccine uses the chimpanzee adenovirus as a vector to introduce the corona virus spike protein mRNA into the human cells.

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True or False

The enzyme “reverse transcriptase” is used to create a cDNA (complementary DNA) of the Corona virus in order to detect it via RT-PCR.

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True or False