Mer Scott
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Identify causes of deviations from simple Mendelian ratios. • Discuss how environmental factors may affect phenotype. • Explain how single genes can affect numerous phenotypic traits. • Explain that some phenotypic traits are affected by several loci.

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Mer Scott
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L24 Extensions of Mendelian genetics

Frage 1 von 10

1

If two events are of each other, we use the product rule, and their probabilities.

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    independent
    multiply

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Frage 2 von 10

1

What is the probability of getting an AaBbcc offspring from the cross of Aa BB Cc x Aa Bb cc?

Wähle eine der folgenden:

  • 50%

  • 25%

  • 12.5%

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Frage 3 von 10

1

If you observed a 2:1 ratio for a gene in offspring, what could you assume?

Wähle eine der folgenden:

  • One allele combination is lethal and so is never observed.

  • One allele combination never leads to a phenotype.

  • One allele combination is very rare.

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Frage 4 von 10

1

Greater polymorphism in a population can be advantageous for survival and evolution.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 5 von 10

1

Choose the incorrect statement about Incomplete Dominance.

Wähle eine der folgenden:

  • Both alleles appear to be expressed equally by all cells, showing an intermediate phenotype which is neither.

  • A cross between two F1 individuals with a blended appearance of alleles will produce offspring in a 1:2:1 ratio, where 50% of the offspring have the phenotype of a blended appearance and the other 50% display single alleles.

  • It proves the blending inheritance theory.

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Frage 6 von 10

1

Which statement best describes co-dominance?

Wähle eine der folgenden:

  • Both alleles are expressed on the phenotype at the same time.

  • Neither alleles appear to be expressed on the phenotype, but instead an intermediate between them is seen.

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Frage 7 von 10

1

The ABO blood antigen system is a good example of:

Wähle eine der folgenden:

  • incomplete dominance

  • co-dominance

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Frage 8 von 10

1

Epistasis describes the situation where one gene the action of another. Hence, if the gene to produce one enzyme in a is damaged or ineffective, the next enzyme and gene in the chain may be perfectly but will never produce an end product because their precursor is dysfunctional. The second gene is said to be under of the first.

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    affects
    metabolic pathway
    functional
    epistatic control

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Frage 9 von 10

1

Wähle von der Dropdown-Liste, um den Text zu vervollständigen.

A phenotype controlled by many genes which have an additive effect is known as a ( polymorphic, polygenic ) trait, and example being ( skin colour, weight, or height etc., eye colour, hair colour, etc. ).

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Frage 10 von 10

1

What is pleiotropy?

Wähle eine der folgenden:

  • One gene having many phenotypic affects.

  • One gene affecting many other genes.

  • Many genes affecting the phenotype in a summative way.

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