IA MODIFIED MASTERING BIOLOGY WITH E TEX
IA MODIFIED MASTERING BIOLOGY WITH E TEX
12th Edition
ISBN: 9780136781752
Author: Urry
Publisher: PEARSON
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Chapter 38, Problem 38.1CR

What changes occur to the four types of floral parts as a flower changes into a fruit?

Expert Solution & Answer
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Summary Introduction

To determine: The changes that occur to the four types of floral parts as a flower changes into a fruit.

Introduction: Flowers are the reproductive part of a modified thick shoot of an angiospermic plant. There involve various parts that make up the structure of a flower. The four main floral organs in flowers are sepals, petals, stamens, and carpels.

Explanation of Solution

The first step of fruit formation starts with pollination followed by fertilization. Ovule is a part of the female reproductive system in plants. They are contained in the ovaries. After fertilization, the ovule develops to form a seed that contains nucellus, protective coat, and plant embryo (female gametophyte). Ovary covers the ovule. After fusing with the male gamete, the ovule develops into a seed, and the ovary develops into a fruit. The petals, stamens, and sepals typically shed off from the flower. The pistil and stigma start to wither, and the ovary begins to enlarge and ripen into fruit. The journey from flower to fruit includes several variables like weather and climatic conditions that favor the development and ripening of fruits. The changes in any of these variables can result in fewer flowers and poor quality of fruits.

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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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Plant Reproduction in Angiosperms; Author: Amoeba Sisters;https://www.youtube.com/watch?v=HLYPm2idSTE;License: Standard YouTube License, CC-BY