By Penny Dowdy
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Additional resources for Animal Cells
In the Lab Map of Me One person’s entire set of DNA is a genome. One person has an average of 30,000 genes. The Human Genome Project shows a map of all of the genes that may be found in a human. Scientists know what those genes are. Now they have to figure out what all of them do. 37 Expensive Genes If you go to a pet store, a Chihuahua may cost $500. At a pet shelter, a mutt can cost less than $50. Why are the costs so different? Purebreds Purebred animals are animals that have the same breed of parents, grandparents, and so on.
The process of meiosis creates gametes. Meiosis has two cell divisions rather than one. Yet the DNA splits only once. This means one mother cell ends up making four daughters. The gametes have half the normal number of chromosomes and are not identical to the parent. Meiosis I begins as the cell makes a copy of its DNA. 1. Prophase I DNA shortens and thickens to form chromosomes. Pairs of similar chromosomes line up tightly beside each other. The nuclear membrane disappears. Centrioles move to opposite ends of the cell.
The cells can show whether the baby will be born with severe diseases. Knowing this ahead of time lets parents prepare to care for the baby. After the baby is born, genetic testing can show if the infant is missing genes. Testing tells if the child has genes that will cause problems doctors would not see otherwise. Detectives can now use DNA to match evidence at crime scenes with the criminals that commit the crimes. DNA can come from any human cell. Hair or even fingernail clippings can lead detectives to criminals.
Animal Cells by Penny Dowdy