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... cannot roll their tongues. Bob can roll his tongue, but his mother could not. He is married to Sally, who cannot roll her tongue. What is the probability that their first born child will not be able to roll his tongue? ...
Heredity
Heredity

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Alleles - Schoolwires.net
Alleles - Schoolwires.net

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BIO 112 Review - Crossword Labs
BIO 112 Review - Crossword Labs

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Heredity
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mendel and the gene idea - Phillips Scientific Methods

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Select one of your Biology instructors from another class and look
Select one of your Biology instructors from another class and look

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Genetics Quiz Study Guide

... Phenotype. The observable traits or properties of an organism. Refers to both genetic and non-genetic traits. Often used to refer to a single trait. For example: "My phenotype is hairy knuckles and my genotype is Hh." Population. A local group of individuals belonging to the same species, which are ...
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... 8. A particular allele can have different effects if it is inherited from a male rather than a female. This phenomenon is known as _____. extranuclear inheritance aneuploidy sex linkage Prader-Willi syndrome genomic imprinting 9. Human mitochondria _____. are inherited as an X-linked trait are all i ...
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... genes that make up a gene pair might or might not contain the same information about a trait.  If a pair of chromosomes contains different alleles for a trait, that trait is called a hybrid .  When a trait has two identical alleles, it’s called pure. ...
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Genetics - Midway ISD

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Genetics Practice Problems - Simple Worksheet

... 7. To a geneticist, the notation rr means two __________________________ alleles 8. To a geneticist, the notation Rr means one ____________________ and one ____________ allele 9. __________________________is the likelihood that a particular event will occur. 10. An organism that has two identical al ...
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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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