The "green revolution": food producers needed to maximize yields in the first half of the 20th century. From the 1950's to 1960's, there was an extensive effort world-wide to increase crop productivity. Norman Borlaug, the "Father of the Green Revolution", is credited with saving over a billion people from starvation. He received the Nobel Peace Prize in 1970. The approach applied genetic crosses to develop high yield varieties of cereal grains, as well as efforts to improve irrigation infrastructure, management techniques, hybrid seed distribution, synthetic fertilizers, and pesticides. Let's consider additive alleles and their contribution to a trait: Problem: Additive allele 'A' contributes to increased yield of rice. Nonadditive allele 'a' does not. Hence, there are three genotypes and phenotypes possible: - AA: high yield - Aa: intermediate yield e aa: low yield Imagine that rice crop yield is controlled by four additive genes, A, B, C, and D. 1. Farmer Leslie has a true-breeding strain of rice that gives an intermediate yield. Farmer Diana has a different variety of true-breeding rice, but it still gives intermediate yield. The farmers cross their two varieties and obtain a hybrid variety that still has intermediate yield. But....they self-pollinate the F1s together and are surprised to get some individual F2 plants that have higher yields than either of the two parent varieties. What are example parent genotypes that could account for the results in the F1 & F2 generations? Diagram the parent x parent cross, and the F1 x F1 cross. What is an example of a high yield F2 plant?
The "green revolution": food producers needed to maximize yields in the first half of the 20th century. From the 1950's to 1960's, there was an extensive effort world-wide to increase crop productivity. Norman Borlaug, the "Father of the Green Revolution", is credited with saving over a billion people from starvation. He received the Nobel Peace Prize in 1970. The approach applied genetic crosses to develop high yield varieties of cereal grains, as well as efforts to improve irrigation infrastructure, management techniques, hybrid seed distribution, synthetic fertilizers, and pesticides. Let's consider additive alleles and their contribution to a trait: Problem: Additive allele 'A' contributes to increased yield of rice. Nonadditive allele 'a' does not. Hence, there are three genotypes and phenotypes possible: - AA: high yield - Aa: intermediate yield e aa: low yield Imagine that rice crop yield is controlled by four additive genes, A, B, C, and D. 1. Farmer Leslie has a true-breeding strain of rice that gives an intermediate yield. Farmer Diana has a different variety of true-breeding rice, but it still gives intermediate yield. The farmers cross their two varieties and obtain a hybrid variety that still has intermediate yield. But....they self-pollinate the F1s together and are surprised to get some individual F2 plants that have higher yields than either of the two parent varieties. What are example parent genotypes that could account for the results in the F1 & F2 generations? Diagram the parent x parent cross, and the F1 x F1 cross. What is an example of a high yield F2 plant?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:The "green revolution": food producers needed to maximize yields in the first half of the 20th
century. From the 1950's to 1960’s, there was an extensive effort world-wide to increase crop
productivity. Norman Borlaug, the "Father of the Green Revolution", is credited with saving over
a billion people from starvation. He received the Nobel Peace Prize in 1970.
The approach applied genetic crosses to develop high yield varieties of cereal grains, as
well as efforts to improve irrigation infrastructure, management techniques, hybrid seed
distribution, synthetic fertilizers, and pesticides.
Let's consider additive alleles and their contribution to a trait:
Problem: Additive allele 'A' contributes to increased yield of rice. Nonadditive allele 'a' does
not. Hence, there are three genotypes and phenotypes possible:
-> AA: high yield
→ Aa: intermediate yield
aa: low yield
Imagine that rice crop yield is controlled by four additive genes, A, B, C, and D.
1. Farmer Leslie has a true-breeding strain of rice that gives an intermediate yield.
Farmer Diana has a different variety of true-breeding rice, but it still gives intermediate yield.
The farmers cross their two varieties and obtain a hybrid variety that still has intermediate
yield.
But....they self-pollinate the F1s together and are surprised to get some individual F2 plants
that have higher yields than either of the two parent varieties.
What are example parent genotypes that could account for the results in the F1 & F2
generations? Diagram the parent x parent cross, and the F1 x F1 cross. What is an example of
a high yield F2 plant?
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