Mer Scott
Test por , creado hace más de 1 año

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
Creado por Mer Scott hace más de 7 años
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L24 Extensions of Mendelian genetics

Pregunta 1 de 10

1

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

Arrastra y suelta para completar el texto.

    independent
    multiply

Explicación

Pregunta 2 de 10

1

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

Selecciona una de las siguientes respuestas posibles:

  • 50%

  • 25%

  • 12.5%

Explicación

Pregunta 3 de 10

1

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

Selecciona una de las siguientes respuestas posibles:

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

  • One allele combination never leads to a phenotype.

  • One allele combination is very rare.

Explicación

Pregunta 4 de 10

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 5 de 10

1

Choose the incorrect statement about Incomplete Dominance.

Selecciona una de las siguientes respuestas posibles:

  • 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.

Explicación

Pregunta 6 de 10

1

Which statement best describes co-dominance?

Selecciona una de las siguientes respuestas posibles:

  • 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.

Explicación

Pregunta 7 de 10

1

The ABO blood antigen system is a good example of:

Selecciona una de las siguientes respuestas posibles:

  • incomplete dominance

  • co-dominance

Explicación

Pregunta 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.

Arrastra y suelta para completar el texto.

    affects
    metabolic pathway
    functional
    epistatic control

Explicación

Pregunta 9 de 10

1

Selecciona la opción correcta de los menús desplegables para completar el 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. ).

Explicación

Pregunta 10 de 10

1

What is pleiotropy?

Selecciona una de las siguientes respuestas posibles:

  • One gene having many phenotypic affects.

  • One gene affecting many other genes.

  • Many genes affecting the phenotype in a summative way.

Explicación

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