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L24 Extensions of Mendelian genetics

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Preguntas del test (10)

  1. 1If two events are [blank_start]independent[blank_end] of each other, we use the product rule, and [blank_start]multiply[blank_end] their probabilities.
    1. Aindependent
    2. Bmultiply
  2. 2What is the probability of getting an AaBbcc offspring from the cross of Aa BB Cc x Aa Bb cc?
    1. A50%
    2. B25%
    3. C12.5%
  3. 3If you observed a 2:1 ratio for a gene in offspring, what could you assume?
    1. AOne allele combination is lethal and so is never observed.
    2. BOne allele combination never leads to a phenotype.
    3. COne allele combination is very rare.
  4. 4Greater polymorphism in a population can be advantageous for survival and evolution.
    1. AVerdadero
    2. BFalso
  5. 5Choose the incorrect statement about Incomplete Dominance.
    1. ABoth alleles appear to be expressed equally by all cells, showing an intermediate phenotype which is neither.
    2. BA 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.
    3. CIt proves the blending inheritance theory.
  6. 6Which statement best describes co-dominance?
    1. ABoth alleles are expressed on the phenotype at the same time.
    2. BNeither alleles appear to be expressed on the phenotype, but instead an intermediate between them is seen.
  7. 7The ABO blood antigen system is a good example of:
    1. Aincomplete dominance
    2. Bco-dominance
  8. 8Epistasis describes the situation where one gene [blank_start]affects[blank_end] the action of another. Hence, if the gene to produce one enzyme in a [blank_start]metabolic pathway[blank_end] is damaged or ineffective, the next enzyme and gene in the chain may be perfectly [blank_start]function[blank_end] but will never produce an end product because their precursor is dysfunctional. The second gene is said to be under [blank_start]epistatic control[blank_end] of the first.
    1. Aaffects
    2. Bmetabolic pathway
    3. Cfunctional
    4. Depistatic control
  9. 9A phenotype controlled by many genes which have an additive effect is known as a [blank_start]_______[blank_end] trait, and example being [blank_start]______[blank_end].
    1. Apolymorphic
    2. Bpolygenic
    3. Cskin colour, weight, or height etc.
    4. Deye colour, hair colour, etc.
  10. 10What is pleiotropy?
    1. AOne gene having many phenotypic affects.
    2. BOne gene affecting many other genes.
    3. CMany genes affecting the phenotype in a summative way.

Información

Descripción
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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