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Ch. 25 - Quantitative Genetics and Multifactorial Traits

Chapter 24, Problem 19

In a population of 100 inbred, genotypically identical rice plants, variance for grain yield is 4.67. What is the heritability for yield? Would you advise a rice breeder to improve yield in this strain of rice plants by selection?

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Hey everyone, Let's take a look at this question. Together in a population of Jenna typically identical tomato plants. The variance for weight is 5.24 determine the broad sense heritability. So we know that the broad sense heritability formula is H 20 equals V sub G over Visa P. Where Visa G. Is that variants for the genotype? And in this case since there Jenna typically identical, the variants would be zero and Visa P. Is that variance of the phenotype In this case it is 5.24. So we have 5.24, which means that H two equals 0/ 20.24, which when we do the math comes out to zero. So answer choice A is the correct answer because in this population of gina typically identical tomato plants. When we solve the broad sense heritability formula of H 20 equals V. G over VP. Where we have V. G equals zero and V p equals 5.24. We end up with zero as our total So answer choice A is the correct answer. I hope you found this video to be helpful. Thank you and goodbye
Related Practice
Textbook Question

In an assessment of learning in Drosophila, flies were trained to avoid certain olfactory cues. In one population, a mean of 8.5 trials was required. A subgroup of this parental population that was trained most quickly (mean=6.0) was interbred, and their progeny were examined. These flies demonstrated a mean training value of 7.5. Calculate realized heritability for olfactory learning in Drosophila.

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Textbook Question

Suppose you want to develop a population of Drosophila that would rapidly learn to avoid certain substances the flies could detect by smell. Based on the heritability estimate you obtained in Problem 16, do you think it would be worth doing this by artificial selection? Why or why not?

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Textbook Question

In a population of tomato plants, mean fruit weight is 60 g and h² is 0.3. Predict the mean weight of the progeny if tomato plants whose fruit averaged 80 g were selected from the original population and interbred.

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Textbook Question

Many traits of economic or medical significance are determined by quantitative trait loci (QTLs) in which many genes, usually scattered throughout the genome, contribute to expression.

What general procedures are used to identify such loci?

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Textbook Question

Many traits of economic or medical significance are determined by quantitative trait loci (QTLs) in which many genes, usually scattered throughout the genome, contribute to expression.

What is meant by the term cosegregate in the context of QTL mapping? Why are markers such as RFLPs, SNPs, and microsatellites often used in QTL mapping?

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Textbook Question

A 3-inch plant was crossed with a 15-inch plant, and all F₁ plants were 9 inches. The F₂ plants exhibited a 'normal distribution,' with heights of 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15 inches.

What ratio will constitute the 'normal distribution' in the F₂?

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