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Chapter 10: Flowers and Reproduction, Cross-Link Connections: Apple fruits…
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Cross-Link Connections: Apple fruits have developed from flowers, and the seeds inside the fruits developed form egg cells inside the flowers. All egg cells produced by this tree have similar genes, but sperm cells were necessary to fertilize the eggs and bees may have brought many types of sperm cells from many different apple trees. Although every seed here has the same maternal parent, it is possible that the seeds all have different paternal parents. The seeds are not genetically identical.
Cross-Link Connection: Kalanchoe plants are called maternity plants because they produce plantlets complete with stems, roots, and leaves along their leaf margins. Although hundreds of plantlets can be produced, all nuclear divisions are mitotic-duplication division- and thus all of these plantlets are genetically identical to the parent. None is superior.
Cross-link Connection: Chollas, a species of Opuntia have branches only weakly attached to the trunk. If an animal brushes against a branch, the spines stick to the animal and the branch is pulled from the plant. After the animal dislodges the branch, it roots and grows into a new plant. Long distance distribution almost as extensive as that of seeds can occur.
