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3 - socesbio.c…
3 - socesbio.c…

... Today you will find out what your alien looks like, based on it’s parents’ genetics. In order to figure out the exact genotype and phenotype, you will complete a set of Punnett squares that show what your alien looks like. There are several categories, and not all aliens will have the same traits. D ...
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10.2: Dihybrid Crosses

4th Quarter Review
4th Quarter Review

... • Genes for group A and B are dominant over genes for group O. • Possible genotypes are AA, AO, BB, BO,OO or AB. • Since blood type A and type B are dominant they are said to share codominance. ...
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... “The genetics of dimples is actually rather interesting. Dimples are a dominant trait, which means that it only takes one gene to inherit dimples. If neither of your parents has dimples, you shouldn't have them either, unless you experience a spontaneous mutation. If one of your parents has dimples, ...
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... Corn is bred for traits that improve its usefulness for specific purposes. For example, it may be bred to grow in various climates, to produce more corn, or to be better tasting. These traits depend on the alleles inherited by the corn plant. Suppose that you are studying the color and texture of ker ...
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... o In the flower-color example, the F 1 plants inherited a purple-flower allele from one parent and a white-flower allele from the other. o The plants had purple flowers because the allele for that trait is dominant. 4. Mendel’s law of segregation states that the two alleles for a heritable character ...
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Hardy-Weinberg Principle • Population genetics

... secretory diarrhea than normal, non-carrier mice. Thus it appeared for a time that resistance to cholera explained the selective advantage to being a carrier for CF and why the carrier state was so frequent. Another theory for the prevalence of the CF mutation is that it provides resistance to tuber ...
Heredity and Genetics - Olympic High School Home Page
Heredity and Genetics - Olympic High School Home Page

... In flowers, red color (R) is dominant to blue color (r). 1. What possible genotypes produce a blue flower? What possible genotypes produce a red flower? 2. Explain how you could determine the actual genotype of a red flower by performing a genetic cross many times and looking at the offspring phenot ...
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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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