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Genes and Chromosomes
Genes and Chromosomes

... the drosphilia crosses but does not provide a complete explanation – 83% have gene combinations like their parents – 17% have new gene combinations • Recombinants=individuals with new combinations of genes ...
notes - Humble ISD
notes - Humble ISD

...  With treatment, patients can survive into adulthood.  Most common ___________ genetic disorder in the __________________________ among Caucasians. 3. Phenylketonuria or ________  Characterized by an inability to breakdown the amino acid, ________________________.  If untreated, results in sever ...
Chapters 11-13: Classical Genetics
Chapters 11-13: Classical Genetics

... vertical line between individuals = children 4. dominant versus recessive patterns, sexlinked (X), blood type and other genetic traits can be traced and determined C. Other human patterns of inheritance 1. polygenic = many genes affect the same trait a. most human traits (eye color, hair color, ski ...
13q deletions including RB1 FTNW
13q deletions including RB1 FTNW

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Chapter 6 Notes
Chapter 6 Notes

... What is a trait? Give an example of one of the seven traits that Mendel followed. ...
Lecture_15_Pop Dynamics_Humans_Part II
Lecture_15_Pop Dynamics_Humans_Part II

... Sex-Linked Genes – Sex-linked genes • Are any genes located on a sex chromosome. • Were discovered during studies on fruit flies. ...
Practice test answers
Practice test answers

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HL#1 Meiosis - hutchhighIBbiology
HL#1 Meiosis - hutchhighIBbiology

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Genetics
Genetics

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unit 8 - introduction to genetics
unit 8 - introduction to genetics

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Answer Key

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Chapter 11 GENETICS
Chapter 11 GENETICS

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11- 4 Meiosis

... In male animals, the haploid gametes produced by meiosis are called sperm. Four usable male gametes are formed by meiosis. The female gamete is called an egg in animals and in some plants. One usable female gamete is formed and 3 polar bodies that disintegrate in some organisms. Comparing Mitosis an ...
userfiles/153/my files/15_lecture_presentation?id=3403
userfiles/153/my files/15_lecture_presentation?id=3403

... • In mammalian females, one of the two X chromosomes in each cell is randomly inactivated during embryonic development • The inactive X condenses into a Barr body • If a female is heterozygous for a particular gene located on the X chromosome, she will be a mosaic for that character • As a consequen ...
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Essential Question: How is the combination of genes

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14 – Mendel and the Gene Idea

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video slide - Massachusetts Department of Higher Education
video slide - Massachusetts Department of Higher Education

... will have the disorder, regardless of sex. Daughters who do not have the disorder will be carriers, where as males without the disorder will be completely free of the recessive allele. ...
Answers to End-of-Chapter Questions – Brooker et al ARIS site
Answers to End-of-Chapter Questions – Brooker et al ARIS site

... round pollen, 3/16 of the offspring would have red flowers and long pollen and 1/16 of the offspring would have red flowers and round pollen. 3. How did the observed results differ from the predicted results? How did Bateson and Punnett explain the results of this particular cross? Answer: Though al ...
If there are “CUES” listed within the question, please USE them and
If there are “CUES” listed within the question, please USE them and

... 1) Explain the Inquiry & Experiment in Figure 15.4. Include in your answer an explanation regarding why only the males have white eyes. Is it possible for females to have white eyes? Provide a Punnett square as evidence to support your answer. (CUES: dominant, recessive, sex-linked.) 2) Use Figure 1 ...
1. In dogs the allele for dark Brown hair color (E)
1. In dogs the allele for dark Brown hair color (E)

... Two types of females occur in honey bees: the Queen and the worker bee. Depending on the food received by each female larvae, they could be either a Queen or a worker bee. What is this phenomena called where this difference in adult stage occurs? A. Metamorphosis B. Modification C. Mutation D. Selec ...
unit v – mendelian genetics
unit v – mendelian genetics

... • X Inactivation in Females o During embryonic development, one X chromosome in female cells is inactivated due to addition of methyl group to its DNA o Dosage compensation o Inactive X chromosome condenses; known as Barr body o Occurs randomly  Females will have some cells where “Dad’s copy” of X ...
x2-5 genetics Sp12
x2-5 genetics Sp12

... genes & environment Even sex can be altered by environment! (ex. exposure to certain hormones/chemicals) BPA is a chemical used in making some plastics. Mimics estrogen and might alter reproductive anatomy and function in early development. But does not change genetic sex! ...
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Skewed X-inactivation

Skewed X chromosome inactivation occurs when the inactivation of one X chromosome is favored over the other, leading to an uneven number of cells with each chromosome inactivated. It is usually defined as one allele being found on the active X chromosome in over 75% of cells, and extreme skewing is when over 90% of cells have inactivated the same X chromosome. It can be caused by primary nonrandom inactivation, either by chance due to a small cell pool or directed by genes, or caused by secondary nonrandom inactivation, which occurs by selection. Most females will have some levels of skewing. It is relatively common in adult females; around 35% of women have skewed ratio over 70:30, and 7% of women have an extreme skewed ratio of over 90:10. This is of medical significance due to the potential for the expression of disease genes present on the X chromosome that are normally not expressed due to random X inactivation. X chromosome inactivation occurs in females to provide dosage compensation between the sexes. If females kept both X chromosomes active they would have twice the number of active X genes than males, who only have one copy of the X chromosome. At approximately the time of implantation (see Implantation (human embryo), one of the two X chromosomes is randomly selected for inactivation. The cell undergoes transcriptional and epigenetic changes to ensure this inactivation is permanent. All progeny from these initial cells will maintain the inactivation of the same chromosome, resulting in a mosaic pattern of cells in females.
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