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Meiosis
Meiosis

... • The alleles on homologous chromosomes may differ, as in the case of heterozygous individuals. • Organisms (normally) receive one set of homologous chromosomes from each parent. • Heterozygous: Having two different alleles (one dominant, one recessive) of a gene pair • Homozygous: Having identical ...
genetics keystone review
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Genetics and Reproduction - Effingham County Schools
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... different from their parents. They have some genetic traits of both parents, but are not exactly like either. They always have twice as many chromosomes as their parents, since they have two parents. ...
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Meiosis - Northern Highlands
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PowerPoint 簡報
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CHAPTER 15
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... each other at the centromere. These chromatids are often called sister chromatids because they are identical. During mitosis the two chromatids of a chromosome separate and become independent chromosomes; one of these chromosomes goes to each daughter cell. To keep our model simple, we will begin by ...
Genetics Clicker - Solon City Schools
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... Farrah recently took her baby Sophia to the mall to get her ears pierced. She noticed that her baby had free unattached ear lobes. Farrah thought this was odd because her earlobes were attached and having attached earlobes is a dominant caused condition. What must be Farrah’s genotype and if Farrah ...
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Genes and Traits Handout

... The outcome determines the offspring. If half of the offspring are albino, then the unknown is heterozygous (Aa). If all of the offspring have normal skin color, then the unknown is homozygous dominant. ...
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... • Klinefelter’s Syndrome– the 23rd set of sex chromosomes is ______ (an extra ____) • Male with reduced masculine characteristics, enlarged breasts, obesity, and excessive height • Turner’s Syndrome– the 23rd pair is ______ an ___ for females • Female who is very short, infertile, and sexually under ...
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X-inactivation



X-inactivation (also called lyonization) is a process by which one of the two copies of the X chromosome present in female mammals is inactivated. The inactive X chromosome is silenced by its being packaged in such a way that it has a transcriptionally inactive structure called heterochromatin. As nearly all female mammals have two X chromosomes, X-inactivation prevents them from having twice as many X chromosome gene products as males, who only possess a single copy of the X chromosome (see dosage compensation). The choice of which X chromosome will be inactivated is random in placental mammals such as humans, but once an X chromosome is inactivated it will remain inactive throughout the lifetime of the cell and its descendants in the organism. Unlike the random X-inactivation in placental mammals, inactivation in marsupials applies exclusively to the paternally derived X chromosome.
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