Lesson test: The heredity problem

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The heredity problem

1.[3p]
What is Jenkin's swamping objection?

Under blending, a favourable novelty is halved every generation and is diluted away before selection can act

Correct

Under blending, favourable variants are always recessive

The answer is: Under blending, a favourable novelty is halved every generation and is diluted away before selection can act

Breeders reach a limit, so natural selection must reach one too

The answer is: Under blending, a favourable novelty is halved every generation and is diluted away before selection can act

New variants are too rare to appear at all

The answer is: Under blending, a favourable novelty is halved every generation and is diluted away before selection can act

2.[2p]
Under strict blending the variance halves each generation. What percentage of the original variance remains after 5 generations?

CorrectNot quite: 3.125

3.[2p]
Under blending inheritance, a population becomes uniform even with no selection acting at all.

True

Correct

False

The answer is: True

4.[3p]
What is the single observation in Mendel's F2 that kills blending?

Wrinkled seeds reappear unchanged after a generation of complete concealment

Correct

Round seeds outnumber wrinkled ones three to one

The answer is: Wrinkled seeds reappear unchanged after a generation of complete concealment

The F1 generation is entirely round

The answer is: Wrinkled seeds reappear unchanged after a generation of complete concealment

Two characters assort independently

The answer is: Wrinkled seeds reappear unchanged after a generation of complete concealment

5.[2p]
Mendel counted 5,474 round and 1,850 wrinkled F2 seeds. What is the observed ratio of round to wrinkled?

CorrectNot quite: 2.96

6.[2p]
A dihybrid F2 of 556 seeds is tested against 9:3:3:1. How many round yellow seeds are expected?

CorrectNot quite: 312.75

7.[3p]
What did R. A. Fisher show about Mendel's data in 1936?

Select all that apply

The agreement with the expected ratios is closer than sampling would ordinarily give

Correct

Scoring true-breeding plants from ten seeds misclassifies about 5.6 per cent of segregating plants

Correct

The published conclusions are wrong

The answer is: The agreement with the expected ratios is closer than sampling would ordinarily give, Scoring true-breeding plants from ten seeds misclassifies about 5.6 per cent of segregating plants, The total chi-square was about 41.6 on 84 degrees of freedom

The total chi-square was about 41.6 on 84 degrees of freedom

Correct

8.[2p]
What breaks independent assortment, as Morgan's group explained from 1911?

CorrectNot quite: linkage

9.[3p]
Match each camp or person to their position after 1900.

Bateson
de Vries
Pearson
Weldon

measured the resemblance between relatives
new species arise in a single mutational step
continuous characters are what selection acts on
discrete factors, evolution by jumps

Show the answer

Bateson: discrete factors, evolution by jumps de Vries: new species arise in a single mutational step Pearson: continuous characters are what selection acts on Weldon: measured the resemblance between relatives

1.[3p] What is Jenkin's swamping objection?

2.[2p] Under strict blending the variance halves each generation. What percentage of the original variance remains after 5 generations?

3.[2p] Under blending inheritance, a population becomes uniform even with no selection acting at all.

4.[3p] What is the single observation in Mendel's F2 that kills blending?

5.[2p] Mendel counted 5,474 round and 1,850 wrinkled F2 seeds. What is the observed ratio of round to wrinkled?

6.[2p] A dihybrid F2 of 556 seeds is tested against 9:3:3:1. How many round yellow seeds are expected?

7.[3p] What did R. A. Fisher show about Mendel's data in 1936?

8.[2p] What breaks independent assortment, as Morgan's group explained from 1911?

9.[3p] Match each camp or person to their position after 1900.

1.[3p]
What is Jenkin's swamping objection?

2.[2p]
Under strict blending the variance halves each generation. What percentage of the original variance remains after 5 generations?

3.[2p]
Under blending inheritance, a population becomes uniform even with no selection acting at all.

4.[3p]
What is the single observation in Mendel's F2 that kills blending?

5.[2p]
Mendel counted 5,474 round and 1,850 wrinkled F2 seeds. What is the observed ratio of round to wrinkled?

6.[2p]
A dihybrid F2 of 556 seeds is tested against 9:3:3:1. How many round yellow seeds are expected?

7.[3p]
What did R. A. Fisher show about Mendel's data in 1936?

8.[2p]
What breaks independent assortment, as Morgan's group explained from 1911?

9.[3p]
Match each camp or person to their position after 1900.