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Volgvan
3 years ago
10

1.) Species Y and Z have very different genes. Species A and B have only a few different genes. What is most likely true about t

hese species?
A.) Species Y and Z are more closely related to each other than species A and B are to each other.
B.) Species A and B are more closely related to each other than species Y and Z are to each other.
C.) Species Y is the ancestor of species A and species Z is the ancestor of species B.
D.) All four of these species are probably equally related to each other
2.) What is a molecular clock?
A.) a tool scientists use to dat fossils
B.) a tool scientist use to determine how many mutations a species accumulates over time
C.) a tool scientists use to determine how long two species have been evolving independently
D.) a tool scientists use to determine how long it takes to sequence a strand of DNA
3.) What type of mutations do scientists look for in a molecular clock?
A.) mutations that increase fitness
B.) mutations that decrease fitness
C.) mutations that have no effect on fitness
D.) mutations that natural selection can work on
4.) How do scientists calibrate a molecular clock?
A.) they determine the number of mutations accumulated in a gene of species of known age
B.) they compare the ticking of the molecular clock with that of the atomic clock
C.) they use the clock that ticks at the appropriate rate for the divergence rate that they are trying ot calculate
D.) they compare the number of positive mutations that have occurred in a particular species with the number of negative mutations that have occurred
5.) A scientist wants to determine hen lions and house cats last shared a common ancestor. She should use a molecular clock that
A.) "ticks" faster than a molecular clock used to determine when mammals and amphibians last shared an ancestor
B.) "ticks" slower than a molecular clock used to determine when mammals and amphibians last shared an ancestor
C.) "ticks" at the same rate as all other molecular clocks
D.) consists of a gene that accumulates mutations
Biology
1 answer:
ivanzaharov [21]3 years ago
8 0
<span>B.) Species A and B are more closely related to each other than species Y and Z are to each other.

</span><span>Biodiversity depends on a species' ability to reproduce itself. If a species cannot reproduce then it will die out. This depends on the climatic conditions of the region. If there is a natural disaster for example, it will affect a species' ability to reproduce. This reduces the number of diverse species on earth. Biodiversity is the recognised variety of different types of life found on the earth.</span>
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Genes A and B are 10 map units apart and genes B and C are 20 map units apart, with gene B located between genes A and C. What w
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2% of the progeny will be double crossovers for the trihybrid test cross

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----A-------10MU--------B-------------20MU-------------C---

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We can estimate the recombination frequencies by dividing each distance by 100.

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Now that we know the recombination frequencies in each region, we can calculate the expected double recombinant frequency, EDRF, like this:

EDRF = recombination frequency in region I x recombination frequency in region II.

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