Lesson test: What a species is

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What a species is

1.[3p]
Why does the biological species concept earn a place in the theory rather than only in the filing system?

A species is the largest pool over which the forces of population genetics act as one process

Correct

It is the only concept that applies to every organism

The answer is: A species is the largest pool over which the forces of population genetics act as one process

It makes species easy to identify in the field

The answer is: A species is the largest pool over which the forces of population genetics act as one process

It defines species by appearance, which is what collectors need

The answer is: A species is the largest pool over which the forces of population genetics act as one process

2.[2p]
A horse has 64 chromosomes and a donkey 62. How many does a mule have?

CorrectNot quite: 63

3.[3p]
Where does the biological species concept fail?

Select all that apply

Asexual organisms, which do not interbreed in the required sense

Correct

Fossils, where the character cannot be observed

Correct

Long chains of populations, since interbreeding is not transitive

Correct

Sexually reproducing animals living in one place

The answer is: Asexual organisms, which do not interbreed in the required sense, Fossils, where the character cannot be observed, Long chains of populations, since interbreeding is not transitive

4.[3p]
Wright's result gives $F_{S T} = 1 / (1 + 4 N_{e} m)$ . What is $F_{S T}$ when there is one effective migrant per generation?

CorrectNot quite: 0.2

5.[2p]
What process strengthens prezygotic barriers when hybrids are unfit?

CorrectNot quite: reinforcement

6.[3p]
Gene flow between the Rhagoletis host races is 6 per cent per generation. With $s = 0.2$ , what frequency difference can a locus maintain?

CorrectNot quite: 0.70

7.[2p]
The apple and hawthorn races of Rhagoletis are now separate species under the biological species concept.

True

The answer is: False

False

Correct

8.[3p]
Unreduced gametes occur in 0.5 per cent of meioses. One fertilisation in how many produces a tetraploid?

CorrectNot quite: 40000

9.[3p]
Match each case to what it demonstrates.

Alpheus shrimp across Panama
Rhagoletis on apples
Tragopogon miscellus
Ensatina in California

the concept breaking down along a chain
divergence beginning without geographic separation
allopatric splitting dated by one geological event
a new species originating within living memory

Show the answer

Alpheus shrimp across Panama: allopatric splitting dated by one geological event Rhagoletis on apples: divergence beginning without geographic separation Tragopogon miscellus: a new species originating within living memory Ensatina in California: the concept breaking down along a chain

1.[3p] Why does the biological species concept earn a place in the theory rather than only in the filing system?

2.[2p] A horse has 64 chromosomes and a donkey 62. How many does a mule have?

3.[3p] Where does the biological species concept fail?

4.[3p] Wright's result gives FST=1/(1+4Nem). What is FST when there is one effective migrant per generation?

5.[2p] What process strengthens prezygotic barriers when hybrids are unfit?

6.[3p] Gene flow between the Rhagoletis host races is 6 per cent per generation. With s=0.2, what frequency difference can a locus maintain?

7.[2p] The apple and hawthorn races of Rhagoletis are now separate species under the biological species concept.

8.[3p] Unreduced gametes occur in 0.5 per cent of meioses. One fertilisation in how many produces a tetraploid?

9.[3p] Match each case to what it demonstrates.

1.[3p]
Why does the biological species concept earn a place in the theory rather than only in the filing system?

2.[2p]
A horse has 64 chromosomes and a donkey 62. How many does a mule have?

3.[3p]
Where does the biological species concept fail?

4.[3p]
Wright's result gives $F_{S T} = 1 / (1 + 4 N_{e} m)$ . What is $F_{S T}$ when there is one effective migrant per generation?

5.[2p]
What process strengthens prezygotic barriers when hybrids are unfit?

6.[3p]
Gene flow between the Rhagoletis host races is 6 per cent per generation. With $s = 0.2$ , what frequency difference can a locus maintain?

7.[2p]
The apple and hawthorn races of Rhagoletis are now separate species under the biological species concept.

8.[3p]
Unreduced gametes occur in 0.5 per cent of meioses. One fertilisation in how many produces a tetraploid?

9.[3p]
Match each case to what it demonstrates.