Biology of Plants
Biology of Plants
8th Edition
ISBN: 9781429219617
Author: Evert, Ray F./
Publisher: Macmillan Higher Education
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Chapter 12, Problem 1CP
Summary Introduction

To describe: The binomial nomenclature.

Introduction: There are about 10 million eukaryotic species and several unknown number of prokaryotes. The scientific study about the biological diversity and their evolutionary history is known as systematics. Systematics helps to discover all the branches of a phylogenetic tree of life and thus helps to determine the genetic relationship between related organisms.

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Binomial nomenclature was introduced by Carl Linnaeus who attempted to name and describes all known species of plants and animals. He describes each species using 12 words, which s known as polynomials. In order to simplify it, Linnaeus made a permanent “two-term’ system of naming known as “binomial system of nomenclature”. According to binomial nomenclature, every species is described by two words in Latin. The first word is called the “genus name” and the second name is called the “species name”. The binomial name is always written in italics and the first letter of the genus name is written in capital letter.

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Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…
Question #5: Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The genes show independent assortment. Recessive alleles at both loci are required for the facultative apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C. At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype. A facultative apomict male, capable of producing viable pollen, was crossed with a sexually reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following temperatures*: a) 15°C? b) 25°C? *for full credit, show crosses and genotypes where appropriate. Remember to position the female first (left side) in the cross. Type your answer here:
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