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Training Powerpoint
Training Powerpoint

... the creatures will look the same. • First, we will identify the gender of your creature. Find the red female coin (X on both sides) and the black male coin (X on one side, Y on the other). • Place the two coins in the cup and roll them onto the table. Record your results under gender on the ...
Human Genetics
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Chapter 9 Notes
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... 2. shyness in humans has a genetic component – can be amplified or reduced by environment. a) ex. Tom Hanks 3. [READ] Avshalom Caspi and Terrie Moffitt [interview with Moffitt here on npr] made quite a splash in 2002 when they published the paper “Role of Genotype in the Cycle of Violence in Maltrea ...
JSReviewExam#4
JSReviewExam#4

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Lecture: Mendelian Genetics
Lecture: Mendelian Genetics

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Introduction - HobbsAPBiology

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Chapter 16 summary
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Agents of Change
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Final Review Packet - Mercer Island School District
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1. The ability to taste PTC, a bitter substance, is a dominant autosomal

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Mendelian Genetics - Biology Department
Mendelian Genetics - Biology Department

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Genetics 3-2 Power point
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Sex- Linked Traits
Sex- Linked Traits

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Dominance (genetics)



Dominance in genetics is a relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus. The first allele is dominant and the second allele is recessive. For genes on an autosome (any chromosome other than a sex chromosome), the alleles and their associated traits are autosomal dominant or autosomal recessive. Dominance is a key concept in Mendelian inheritance and classical genetics. Often the dominant allele codes for a functional protein whereas the recessive allele does not.A classic example of dominance is the inheritance of seed shape, for example a pea shape in peas. Peas may be round, associated with allele R or wrinkled, associated with allele r. In this case, three combinations of alleles (genotypes) are possible: RR, Rr, and rr. The RR individuals have round peas and the rr individuals have wrinkled peas. In Rr individuals the R allele masks the presence of the r allele, so these individuals also have round peas. Thus, allele R is dominant to allele r, and allele r is recessive to allele R. This use of upper case letters for dominant alleles and lower caseones for recessive alleles is a widely followed convention.More generally, where a gene exists in two allelic versions (designated A and a), three combinations of alleles are possible: AA, Aa, and aa. If AA and aa individuals (homozygotes) show different forms of some trait (phenotypes), and Aa individuals (heterozygotes) show the same phenotype as AA individuals, then allele A is said to dominate or be dominant to or show dominance to allele a, and a is said to be recessive to A.Dominance is not inherent to an allele. It is a relationship between alleles; one allele can be dominant over a second allele, recessive to a third allele, and codominant to a fourth. Also, an allele may be dominant for a particular aspect of phenotype but not for other aspects influenced by the same gene. Dominance differs from epistasis, a relationship in which an allele of one gene affects the expression of another allele at a different gene.
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