Mer Scott
Quiz por , criado more than 1 year ago

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
Criado por Mer Scott mais de 7 anos atrás
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L24 Extensions of Mendelian genetics

Questão 1 de 10

1

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

Arraste e solte para completar o texto.

    independent
    multiply

Explicação

Questão 2 de 10

1

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

Selecione uma das seguintes:

  • 50%

  • 25%

  • 12.5%

Explicação

Questão 3 de 10

1

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

Selecione uma das seguintes:

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

  • One allele combination never leads to a phenotype.

  • One allele combination is very rare.

Explicação

Questão 4 de 10

1

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

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 5 de 10

1

Choose the incorrect statement about Incomplete Dominance.

Selecione uma das seguintes:

  • 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.

Explicação

Questão 6 de 10

1

Which statement best describes co-dominance?

Selecione uma das seguintes:

  • 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.

Explicação

Questão 7 de 10

1

The ABO blood antigen system is a good example of:

Selecione uma das seguintes:

  • incomplete dominance

  • co-dominance

Explicação

Questão 8 de 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.

Arraste e solte para completar o texto.

    affects
    metabolic pathway
    functional
    epistatic control

Explicação

Questão 9 de 10

1

Selecione das listas do Menu para completar o texto.

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. ).

Explicação

Questão 10 de 10

1

What is pleiotropy?

Selecione uma das seguintes:

  • One gene having many phenotypic affects.

  • One gene affecting many other genes.

  • Many genes affecting the phenotype in a summative way.

Explicação

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