10 The Chromosome Theory Of Inheritance at University Of Newcastle | Flashcards & Summaries

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What does the principle of independent assortment state?

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alleles of different genes are transmitted to egg cells and sperm cells independently of each other

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Who worked out the chromosome theory of inheritance? What model organism was used?

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Gregor Mendel.

Garden peas.

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What does the study of genetics focus on?

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The inheritance of traits.

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What were the two questions Mendel was addressing in his experiments?

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1. why offspring resemble their parents

2. how transmission of traits occurs

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Explain the two prevailing ideas at the time of Mendel's experiments.

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1. Blending inheritance – parental traits blend such
that their offspring have intermediate traits
2. Inheritance of acquired characteristics –
parental traits are modified and then passed on
to their offspring

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True or false: Peas can self-pollinate or be cross-pollinated.

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True.

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Why did Mendel choose the traits he chose for garden peas?

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- Each had two phenotypes.

- Worked with pure lines: individuals that produce identical offspring when self-polinated.

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What is a phenotype?

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The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.

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What was involved in Mendel's first experiments?

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Crossing pure lines that differed in just one trait (monohybrid cross).

Adults were the parental generation (F0), and the resulting offspring were F1.

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In Mendel's monohybrid cross experiment, what was the F2 ratio of round:wrinkled seeds?

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3:1

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True or false: 

In the monohybrid experiments, the wrinkled seed shape reappeared in the F2 generation (completely unchanged) after not being observed at all in the F1 generation.

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True

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What does the principle of segregation state?

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prior to the formation of eggs and sperm, the alleles of each gene separate so that each egg or sperm cell
receives only one allele copy

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Q:

What does the principle of independent assortment state?

A:

alleles of different genes are transmitted to egg cells and sperm cells independently of each other

Q:

Who worked out the chromosome theory of inheritance? What model organism was used?

A:

Gregor Mendel.

Garden peas.

Q:

What does the study of genetics focus on?

A:

The inheritance of traits.

Q:

What were the two questions Mendel was addressing in his experiments?

A:

1. why offspring resemble their parents

2. how transmission of traits occurs

Q:

Explain the two prevailing ideas at the time of Mendel's experiments.

A:

1. Blending inheritance – parental traits blend such
that their offspring have intermediate traits
2. Inheritance of acquired characteristics –
parental traits are modified and then passed on
to their offspring

Mehr Karteikarten anzeigen
Q:

True or false: Peas can self-pollinate or be cross-pollinated.

A:

True.

Q:

Why did Mendel choose the traits he chose for garden peas?

A:


- Each had two phenotypes.

- Worked with pure lines: individuals that produce identical offspring when self-polinated.

Q:

What is a phenotype?

A:

The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.

Q:

What was involved in Mendel's first experiments?

A:

Crossing pure lines that differed in just one trait (monohybrid cross).

Adults were the parental generation (F0), and the resulting offspring were F1.

Q:

In Mendel's monohybrid cross experiment, what was the F2 ratio of round:wrinkled seeds?

A:

3:1

Q:

True or false: 

In the monohybrid experiments, the wrinkled seed shape reappeared in the F2 generation (completely unchanged) after not being observed at all in the F1 generation.

A:

True

Q:

What does the principle of segregation state?

A:

prior to the formation of eggs and sperm, the alleles of each gene separate so that each egg or sperm cell
receives only one allele copy

10 The chromosome theory of inheritance

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