ICTS Science-Biology 105 Teacher Certification, 2nd Edition by Sharon Wynne

By Sharon Wynne

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Extra resources for ICTS Science-Biology 105 Teacher Certification, 2nd Edition (XAM ICTS)

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Vestigial organs: Organs that are smaller and simpler in structure than corresponding parts in the ancestral species are called vestigial organs. They are usually degenerated or underdeveloped. , vestigial hind limbs of whales, vestigial leaves of some xerophytes, vestigial wings of flightless birds like ostriches, etc. SCIENCE: BIOLOGY 40 TEACHER CERTIFICATION STUDY GUIDE COMPETENCY 0008 UNDERSTAND AND APPLY KNOWLEDGE OF THE CHARACTERISTICS AND LIFE FUNCTIONS OF ORGANISMS. 1 Identify the levels of organization of various types of organisms and the structures and functions of cells, tissues, organs, and organ systems.

In contrast, if both parents do not express a trait and one of their children do, that trait is due to a recessive allele. Sex linked traits - the Y chromosome found only in males (XY) carries very little genetic information, whereas the X chromosome found in females (XX) carries very important information. Since men have no second X chromosome to cover up a recessive gene, the recessive trait is expressed more often in men. Women need the recessive gene on both X chromosomes to show the trait.

There is at least one of these dark-staining bodies inside the nucleus of most eukaryotes. The nuclear envelope is two membranes separated by a narrow space. The envelope contains many pores that let RNA out of the nucleus. Ribosomes are the site for protein synthesis. Ribosomes may be free-floating in the cytoplasm or attached to the endoplasmic reticulum. There may be up to a half a million ribosomes in a cell, depending on how much protein is made by the cell. The endoplasmic reticulum (ER) is folded and provides a large surface area.

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