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Biology: The Unity and Diversity o...
Biology: The Unity and Diversity o...
Match each term with the most suitable description.
| _____ | apoptosis | a. blastomers form |
| _____ | embryonic induction | b. rearrangement of cells forms primary tissues |
| _____ | cleavage | c. cells die on cue |
| _____ | gastrulation | d. cells influence neighbours |
| _____ | implantation | e. blastocyst burrows into the uterus |
To match: The each term with their suitable description.
Apoptosis - c. cells die on cue.
Apoptosis is where the cells are programmed to die. During the development, certain cells are programmed to die as they are not further required during the development process by activating the apoptotic genes in the respective cells. An example is the human limb development. The embryonic stages have webbed hands and feet, and as the development continues the webbing is removed by apoptosis
Embryonic induction - d. cells influence neighbors.
During embryonic induction, a group of cells or tissues regulate or influence the development of neighboring cells by paracrine signaling. An example is vertebrate eye development. The retinal tissues direct the development of lens tissue.
Cleavage - a. blastomeres form.
The gene having alternative forms is called alleles. They rise up by mutation and are encoded by the different gene products. These differences can help in the inherited traits. The sperm and egg unite to form the zygote. The zygote then undergoes several mitotic divisions repeatedly. These repeated mitotic divisions are collectively called as cleavage...
Chapter 42 Solutions
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