Titre de l’ouvrage:
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Par: wietseinhetpanhuis • 8 année de cela
Content is okay, but it was written in such poor Dutch that it is almost impossible to read is
Par: jorindejorinde • 9 année de cela
Par: sakvis1 • 6 année de cela
Quelques exemples de cette série de questions pratiques
1.
The allele frequency refers to: 1- the number of copies of an allele in the population as a fraction of all copies of alleles at that locus in the population 2- the number of copies of a particular gene in a population What is true?
Réponse: Only statement 1 is true
2.
Which of the following Two biological causes will result in a deviation from a Hardy-weinberg equilibrium? Assortative mating and selection will cause a deviation from HW. The existence of multiple alleles is irrelevant and for these cases the genotype frequencies in a population that is in HW equilibrium will be:
Réponse: P2:q2:r2:2pq:2pr:2qr. Overdominance (for fitness) will determine the equilibrium frequency, but random mating will always lead to HW!
3.
In a population in Hardy-Weinberg equilibrium we find 16 % aa types. What is the frequency of the dominant allele A?
Réponse: The frequency of aa genotypes is 0.16. Therefore the allele frequency of a is 0.4.(wortel van 0,16) This means that the frequency of A is 1 - 0.4 = 0.6.
4.
In a Hardy-Weinberg population of beetles we find individuals with shiny wings (25%) and others with dull wings (75%). What is de frequency of the recessive allele (q)?
Réponse: We don't know which of the two phenotypes is the dominant and which is the recessive. Therefore, two answers are possible, namely: 0.50 (=square root(0.25)) and 0.87 (=square root(0.75)).
5.
Indicate whether the following statements are true or false. I. If a population is in Hardy-Weinberg equilibrium, the population is produced by random mating of the parental generation. II. A population that is generated by random mating shows Hardy-Weinberg equilibrium.
Réponse: only statement one
6.
Indicate whether the following statements are true or false. I. The simple fact that p(A)+q(a)=1 proves that a population is in Hardy-Wienberg equilibrium. II. The number of heterozygotes for a dominant character is unknown. Nevertheless, in a population of self-fertilizing plants the allele frequency is easily calculated using the equation freq(aa)=q2
Réponse: both are incorrect
7.
If first degree relatives (e.g. brothers) are more alike with respect to a particular trait than second degree relatives (e.g. cousins), then you can safely conclude that this is a heritable trait. true or false?
Réponse: false
8.
Which of the following statements concerning quantitative genetics is/are true? I. Quantitative genetics concerns only the genetics of many segregating loci. II. The underlying principles of quantitative genetics are principally different from Mendelian genetics
Réponse: none of them are true
9.
Which of the two following statements is/are correct? I. Only a subset of familial traits is heritable. II. Familial traits always have a high heritability.
Réponse: only statement one
10.
The broad sense heritability for adult height of people in a small village on the Veluwe is 40 %. In Amsterdam the people are ethnically clearly more heterogeneous than the inhabitants of this small village. Assuming that the environmental variances in the two places are about the same, what do you think will be the broad sense heritability for adult height in Amsterdam?
Réponse: Since there is more genetic variance in Amsterdam, and environmental heterogeneity is about the same, the broad sense heritability is likely to be higher in Amsterdam
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