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Biology Glossary
Biology Glossary

... Microorganisms that lacks chlorophyll A haploid sex cell, egg or sperm, that contains a single copy of each chromosome The functional unit of heredity; a locus on a chromosome that encodes a specific protein or several related proteins The complete genetic material contained in an individual; the ge ...
Unit 11 Human Genetics
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... B. Chromosomal disorders are inherited due to problems with an entire chromosome (which may contain hundreds of genes!) Thus, an individual with even one chromosomal defect will most likely express the disorder. Science hypothesizes that chromosomal disorders arise from mistakes in meiosis during g ...
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... linked genes. It is actually the chromosomes that assort independently during gamete formation, not single genes. The location of genes can be mapped to a chromosome. The rate of crossover events is used to find the distance between genes on a chromosome. The farther apart two genes are, the more li ...
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No Slide Title - Ohio University

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Chapter 10b 2012 File
Chapter 10b 2012 File

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... Probability can be used to predict the outcome of genetic crosses because alleles segregate randomly. The gene combinations that might result from a genetic cross can be determined by drawing a Punnett square. In a Punnett square, alleles are represented by letters. A capital letter represents the d ...
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No Slide Title

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Biology CST Practice Questions

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... represent males and circles represent females. Shading symbolizes the abnormal phenotype. a. is the inheritance pattern X-linked or autosomal? X-linked (recessive) was the best answer since mostly males had the abnormal phenotype. Affected females gave the trait to all sons, but no daughters. I did ...
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Meiosis and Mitosis - Northwest ISD Moodle
Meiosis and Mitosis - Northwest ISD Moodle

... 1. How does Crossing Over create genetic variation? 2. Specifically how were the genes/characteristics different in the siblings even though they came from the same parents? 3. Why is Crossing over important in Meiosis? 4. Are there any traits that your sibling could possibly pass down to the next g ...
Lab Exercise #17
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Heredity Chapter 5-3
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... What do you think would happen if something went wrong during cell division and the sperm or egg cell ended up with either too few or too many chromosomes? Objectives: 1. Explain why sex-linked disorders occur in one sex more often than in the other. 2. Interpret a pedigree. ...
Cross-dressing or Crossing-over: Sex Testing of Women
Cross-dressing or Crossing-over: Sex Testing of Women

... Regular menstrual cycle: Never ...
07Lab_MitoMei - Biology Learning Center at the University of
07Lab_MitoMei - Biology Learning Center at the University of

... •A genome is 1-100s of chromosomes •A genotype refers to the alleles present in a given genome ...
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Essential Question: How is the combination of genes

... S7L3a. Explain the role of genes and chromosomes in the process of inheriting a specific trait. S7L3c. Recognize the selective breeding can produce plants and animals with desired traits. ...
Midterm Exam Review 1. How many chromosomes are in a “normal
Midterm Exam Review 1. How many chromosomes are in a “normal

... of making sperm that contain an X chromosome, 50% for a Y sperm. All females’ eggs will contain one X chromosome. 12. What sex chromosomes does a mother give to her child? Mother can only give an X chromosome 13. What is genotype? The alleles (portions of a gene) of an individual. Ex. Rr ...
Hfr cells
Hfr cells

... Why does the replication of every DNA molecule start with a short segment of RNA? Define: vertical gene transfer, horizontal gene transfer, DNA replication, gene expression, transcription, translation, conjugation, transduction and transformation. How is gene expression in prokaryotes different from ...
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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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