4.7 Investigating diversity Flashcards

1
Q

What are the ways to compare genetic diversity?

A
  • Compare DNA base sequence
  • Compare mRNA base sequence
  • Compare amino-acid sequence of a protein
  • Compare the frequency of measurable or observable characteristics (however less accurate)
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2
Q

Which are the best three ways to investigate diversity?

A
  • Compare base sequence of DNA
  • Compare base sequence of mRNA
    -Compare amino-acid sequence of proteins
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3
Q

What method would you use to compare genetic diveristy within a species and why?

A
  • Compare DNA base sequences
  • To see minor variations
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4
Q

What method would you use to investigate diversity between species and why?

A

Amino-acid sequence of proteins
- To reduce noise

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5
Q

When comparing genetic diversity between species, what must be used to ensure comparison - give an example

A
  • Genes/proteins must be present in all species of interest
  • Respiratory proteins allow comparisons between kingdoms
  • Haemoglobins would not
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6
Q

What can be said about how closely related two organisms are from their base sequence?

A

More differences in base sequence = more distantly related

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7
Q

What can be said about how closely related two organisms are from their amino-acid sequence?

A
  • Less differences = closer related
  • As similar DNA base sequences
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8
Q

When given numerical data for investigating diversity, what must always be reffered to?

A

Means and standard deviation

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9
Q

If there is no overlap between the standard deviations of the mean of A and B, what can be said?

A

There is likely to be a significant difference between A and B

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10
Q

If there is an overlap between the standard deviations of the mean of A and B, what can be said?

A

There is likely no significant difference between A and B

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11
Q

SD calculation

A
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12
Q

Immunological studies

A

look at extent of species- specific antibody binding to compl antigens

greater % binding = more closely related

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13
Q

What does gene technology allow us to do?

A

Read the base sequence of DNA and mRNA.

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14
Q

How do scientists compare evolutionary relationships between species?

A

By comparing how similar the base sequences are.

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15
Q

What does more similar DNA indicate?

A

A closer evolutionary relationship.

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16
Q

Why can mRNA be used to study relationships between species?

A

mRNA sequences are complementary to DNA, so they provide similar information about genetic similarity.

17
Q

Why are observable characteristics useful in investigating diversity?

A

Because they are determined by DNA and proteins, showing similarities and differences.

18
Q

Why are most observable features difficult to distinguish?

A

They are polygenic (coded by more than one gene) and tend to vary continuously.

19
Q

Why might observable characteristics not be a true reflection of genetic differences?

A

Because they can be changed by environmental factors.

20
Q

What determines the amino acid sequence of a protein?

A

mRNA, which is determined by DNA.

21
Q

What does a similar amino acid sequence indicate?

A

That species are more closely related.

22
Q

What are the two types of variation?

A

Inter-specific (between species) and intra-specific (within a species).

23
Q

What statistical measures are used to analyze variation?

A

Mean and standard deviation.

24
Q

What does a large standard deviation indicate?

A

Large variation within a dataset.

25
Q

What is the purpose of normal distribution curves in data collection?

A

To visualize how data is spread within a population.

26
Q

Why is random sampling important?

A

It reduces sampling bias.

27
Q

Why should sample sizes be large?

A

To reduce the influence of chance on results.

28
Q

How can we determine if observed differences are due to chance?

A

By using statistical analysis.

29
Q

Genus

A

1 or more species

30
Q

family

A

many species (many genus)

31
Q

why use a T test

A

to compare mean of data set

data are normally distrubuted

32
Q

what Is meant by genetic diversity

A

number of different alleles of each gene