This lesson reviews the basics of gene inheritance. It compares plants that are homozygous, heterozygous, and hemizgous for an allele and how gene expression is affected by the dominance of an allele. It also explains how to use a Punnett square to predict genotypic and phenotypic ratios of offspring.
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This lesson discusses the final stage of developing genetically engineered crops. The need for backcrossing, and the steps of this breeding method are described. Yield lag, yield drag, and gene stacking are also discussed.
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This lesson will discuss the corn rootworm complex, which consists of
the northern, western, and southern corn rootworm, focusing on the
northern and western species. The information in this lesson will focus
on the biology of corn rootworms in the north central Corn Belt,
including Iowa and Nebraska. Crop producers, crop scouts, students, and
the general public may find the information in this lesson helpful for
identifying corn rootworm, other corn pests, and the feeding damage
caused by each insect.
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This lesson will detail the biochemical mechanisms and genetics of herbicide resistance in weeds. Herbicide resistance is one of the major issues in weed science today; therefore, it is important to have a basic understanding of the process by which it occurred. The management and spread of herbicide-resistant weeds in relationship to the biochemical mechanisms and inheritance of resistance will be explained. Resistance based on changes in the target site versus resistance based on detoxification or other types of resistance will be described.
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