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... Question 1: A suspect, standing before a judge, is on trial for a violent assault. The judge has information on the suspect’s genetic make-up, stating that the suspect has genetic variants associated with increased risk for violent behaviors. • How dependable is this information? • Should the judge ...
Study Guide for the LS
Study Guide for the LS

... the same characteristic are inherited (for example rr or bb)  phenotype: an organism’s inherited physical appearance (blue eyes, tall, curly hair)  genotype: the inherited combination of alleles (BB, Tt)  DNA: hereditary material that controls all the activities of a cell  probability: the mathe ...
Figure 14.0 Painting of Mendel
Figure 14.0 Painting of Mendel

... Recessive: (a)  Not noticeable in appearance when individual has one copy  Individual must have two copies of recessive allele to express the trait ...
First debate of 2008
First debate of 2008

... theoretically, be exactly the same in all respects, even if reared apart. But a number of studies show that they are never exactly alike, even though they are remarkably similar in most respects. So, was the way we behave engrained in us before we were born? Or has it developed over time in response ...
B1.6 Variation - Animated Science
B1.6 Variation - Animated Science

... Genetic and environmental differences Nature – genetic variety • E.g. Eye colour, gender, shape of nose Nurture – environmental variety • E.g. Scars, accents, drinking when pregnant Combined causes of variety • E.g. Height, weight Investigating variety: scientists study twins adopted by different f ...
Twin Studies in Psychiatry and Psychology
Twin Studies in Psychiatry and Psychology

... will call it the “trait-relevant EEA.” The trait-relevant EEA has been taken up by Bouchard, Kendler and other leading twin researchers. In essence, these investigators admit that twin method critics are correct in their observation that MZ twins experience more similar environments than DZs, but cl ...
UNSHARED ENVIRONMENTAL INFLUENCES
UNSHARED ENVIRONMENTAL INFLUENCES

... The result is that, for a male, the sperm (or egg) cells contain half the number of chromosomes (N=23) that normal cells in other parts of the body contain (N=46). Meiosis results in sperm (or egg) cells that are a more or less random collection of one each of the chromosomes from Mom and Dad; ...
Magic Square
Magic Square

... Match each term to its definition. Put the number of the term in the proper square marked by the letter of its definition. If your answers are correct, the numerical total will be the same across each row and down each column. Definitions: A. A variation of a trait or gene. B. Two alleles that are t ...
Intro to Genetics PowerPoint Notes
Intro to Genetics PowerPoint Notes

... V. Special Cases of Dominant and Recessive A. Incomplete Dominance: a genetic cross where one _______________ is not completely dominant over ...
Evolution Terms and Pictures
Evolution Terms and Pictures

... the middle range confer greater survival/reproduction, while phenotypes at both extremes lead to decreased fitness • Directional selection: phenotypes at one end of the spectrum lead to greater survival/reproduction • Disruptive selection: phenotypes at both ends of the spectrum lead to greater surv ...
Test Review Answers - Northwest ISD Moodle
Test Review Answers - Northwest ISD Moodle

... of fertile children, if members were brought together. • 20. The pesticide decreased in efficiency because the least adapted roaches died off, leaving those behind that are suited for that environment • 21. Stabilizing: Favors the middle over the extremes Directional: favors one extreme over the oth ...
Ch. 4. Modern Genetics
Ch. 4. Modern Genetics

... To explain why some human traits show a large variety of phenotypes. To explain how environmental factors can alter the effects of a gene. To explain what determines sex and why some sex linked traits are more common in males than in females. To describe how geneticists use pedigrees. ...
Genetics test vocabulary Review Name: Class: ______ 1. Gregor
Genetics test vocabulary Review Name: Class: ______ 1. Gregor

... 8. An alternate form of a gene: ____allele__________ 9. Having non identical alleles (not pure; ex. Aa): __heterozygous___ 10. Having identical alleles (pure, ex. AA): _homozygous_________ 11. Square used to determine probability and results of cross: punnett 12. The allele that is masked or covered ...
Genetics Summative Assessment review sheet
Genetics Summative Assessment review sheet

...  Know how to complete Punnett squares to find percentages of organisms with certain traits (NB Pg. 13-16 & HW)  Know how to determine organisms genotype and phenotype using Punnett Squares and gene keys (NB Pg.16 & Smiley Activity)  Know how many chromosomes you have in your body cells and how ma ...
Nature vs. Nurture Article
Nature vs. Nurture Article

... The refrigerator holds the blueprints for nearly 2,000 people, a database that Hamer, chief of Gene Structure and Regulation at the National Cancer Institute in Bethesda, Md., hopes will help him find the keys to why we smoke, why we get anxious, why we take risks. In what he describes as "a giant f ...
Quiz 4 Thursday 4
Quiz 4 Thursday 4

... 2. The recurrence risk of heart disease in the monozygotic twin of a proband is 38%; in a dizygotic twin it is 16%; and in a full sibling it is 7%. a) Why is the recurrence risk less for a dizygotic twin then it is for a monozygotic twin? Because heart disease has a genetic component, and monozygoti ...
Extending Mendelian Genetics for two or more genes
Extending Mendelian Genetics for two or more genes

... Dark-skin allele for each gene = A,B,C each contributing one unit of darkness to the phenotype, and are dominant to the alleles a,b,c ...
Basic Genetics
Basic Genetics

... http://learn.genetics.utah.edu/content/basics/ WHAT ARE TRAITS? Explore traits, the characteristics that make us unique. http://learn.genetics.utah.edu/content/basics/traits Identical twins: same DNA, different environment 1. Even with the same DNA, what characteristic differences can be see between ...
Biological Approach
Biological Approach

... other at the age of 35, they were surprised at how different their personalities were. Rita is much more social and out-going than Holly. Use your knowledge of genotype and phenotype to explain this difference in their personalities. ...
Ch. 12 Genetics
Ch. 12 Genetics

... White ...
Ch. 12 Genetics - Cloudfront.net
Ch. 12 Genetics - Cloudfront.net

... Inflated ...
Heredity Review
Heredity Review

... foundation of ___________, the scientific study of heredity. ...
Chapter 3
Chapter 3

... 12. What nature and nurture reasons make one person nearsighted and another not? A study of British twins found that the Pax6 gene, which governs eye formation, has many alleles that make people somewhat nearsighted (Hammond et al., 2004). This research found heritability of almost 90 percent, which ...
DNA- (Deoxyribonucleic acid)- genetic material that carries the
DNA- (Deoxyribonucleic acid)- genetic material that carries the

... Guanine (G), Cytosine (C) are the nitrogen bases. Adenine always pairs with Thymine and Guanine always pairs with Cytosine. With these four base pairs, there are 8,000,000 possible outcomes between two parents and the arrangement of chromosomes. The order of the nitrogen bases is a genetic code to p ...
Supplementary Table 1
Supplementary Table 1

... recombinations. Genotype describes the genetic make-up of an organism and phenotype describes the organism’s appearance based on its genes. Homozygous individuals have two identical alleles for a particular trait, while heterozygous individuals have contrasting alleles. When one allele masks the eff ...
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Twin study



Twin studies reveal the absolute and relative importance of environmental and genetic influences on individuals in a sample. Twin research is considered a key tool in behavioral genetics and in content fields, from biology to psychology. Twin studies are part of the methods used in behavior genetics, which includes all data that are genetically informative – siblings, adoptees, pedigree data etc.Twins are a valuable source for observation because they allow the study of varying family environments (across pairs) and widely differing genetic makeup: ""identical"" or monozygotic (MZ) twins share nearly 100% of their genes, which means that most differences between the twins (such as height, susceptibility to boredom, intelligence, depression, etc.) is due to experiences that one twin has but not the other twin. ""Fraternal"" or dizygotic (DZ) twins share only about 50% of their genes. Thus powerful tests of the effects of genes can be made. Twins share many aspects of their environment (e.g., uterine environment, parenting style, education, wealth, culture, community) by virtue of being born in the same time and place. The presence of a given genetic trait in only one member of a pair of identical twins (called discordance) provides a powerful window into environmental effects.The classical twin design compares the similarity of monozygotic (identical) and dizygotic (fraternal) twins. If identical twins are considerably more similar than fraternal twins (which is found for most traits), this implicates that genes play an important role in these traits. By comparing many hundreds of families of twins, researchers can then understand more about the roles of genetic effects, shared environment, and unique environment in shaping behavior.Modern twin studies have shown that almost all traits are in part influenced by genetic differences, with some characteristics showing a strong influence (e.g. height), others an intermediate level (e.g. personality traits) and some more complex heritabilities, with evidence for different genes affecting different aspects of the trait — as in the case of autism.
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