Q1) Heritability can have a minimum value of _________ and a maximum value of __

Question

Q1) Heritability can have a minimum value of _________ and a maximum value of _________.

0; 10

Q2) Traits such as human height are ________ traits and display ________ variation.

qualitative; discrete

Q3) You are conducting an artificial selection experiment to decrease the time to flowering for an important crop species because earlier (faster) flowering potentially translates to additional crops during the growing season. The mean time to flowering in your initial population is 64 days. You select plants for breeding that flower, on average, in 54 days. If the heritability of flowering time is h2 = 0.8, what is the expected flowering time of your population (in days) after one generation of artificial selection?

54

Q2) All domesticated plants and animals are products of artificial selection

False

Q3) If all members of a population have the exact same value for a particular trait X, then the variance of trait X is zero.

False

Q4) Narrow-sense heritability is a quantification of the proportion of total phenotypic variance due to ____________; broad-sense heritability is a quantification of the proportion of total phenotypic variance due to ____________.

additive genetic variance; total genetic variance

Explanation / Answer

Q1) 0,1

Reason:  If there is no variation in the alleles, then everyone has the same genes and heritability would be zero. whatever differences exist between organisms [variance] must be the result of genes alone.Then, heritability would be 1.0 or 100%, indicating that only the genes are responsible for the variation

Q2) Quantitative,continuous

Reason: A quantitative trait shows continuous variation. Height in humans is a good example. Adult human height ranges from a little over two feet tall to nearly eight feet tall. Height varies this way because 50-100 genes each contribute to adult height; some with large effects and many others with small effect.

Q3) True

Reason: Zero variance means all observations are equal.

Q4. Additive genetic variance,Total genetic variance

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