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Answered by Deborah M. • Biology tutor
3336 Views

What are the differences between plant and animal cells?

Animal and plant cells have some characteristics in common, as when life first evolved on earth, we shared a common ancestor. This was a long time ago: 1.6 Billion years!!! This is why we share the same gene...
CT
Answered by Caroline T. • Biology tutor
12893 Views

In the case of cystic fibrosis, two parents don't suffer from the disease but both carry the recessive cystic fibrosis allele. What is the probability that a child of the parents will suffer from cystic fibrosis.

25%. Draw a punnet square to find this: Write in the alleles for the parents along the top and side of the square, then match up the possible allele combinations for the children inside the square. Cystic fi...
LD
Answered by Louis D. • Biology tutor
4965 Views

Use the example of antibiotic resistant bacteria to explain directional selection.

DNA mutations happen randomly during division by mitosis. Some of these mutations code for antibiotic resistance. When a bacterial colony is exposed to antibiotics most bacteria without the resistance mutati...
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Answered by Vlad P. • Biology tutor
22432 Views

How does water travel up the stem of a plant from the roots to the leaves, wouldn't gravity prevent this?

Water molecules are polar. This means that one end of the molecule is slightly negatively charged (the oxygen atom) and one end of the molecule is slightly positively charges (the hydrogen atoms). The slight...
LR
Answered by Lauren R. • Biology tutor
57321 Views