EBK CAMPBELL BIOLOGY
EBK CAMPBELL BIOLOGY
10th Edition
ISBN: 9780136539414
Author: Reece
Publisher: VST
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Chapter 25.1, Problem 3CC
Summary Introduction

To explain: How the flow of genetic information occurred from RNA to DNA during transformation of ‘RNA world’ to ‘DNA world’.

Concept introduction:

RNA is the self-replicating molecule identified earlier than the DNA. It also functions as enzyme catalysts called the ribozymes. Due to this ability of RNA molecules, the life on Earth proceeds with self-replicating ribozymes referred as RNA world. RNA molecules are stored in the vesicles in protocells. RNA molecules act as a template for DNA synthesis. The double stranded DNA is more stable molecule which replicates more accurately and blossoms the new life of organism. The central dogma of life explains the transformation of RNA to DNA, and vice-versa.

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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…

Chapter 25 Solutions

EBK CAMPBELL BIOLOGY

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