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Chapter 11 PowerPoint – Genetics
Chapter 11 PowerPoint – Genetics

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... that  is  heterozygous  for  round,  yellow  peas  (RrYy)  is  crossed  with  a  pea  plant  that  is   homozygous  for  round  peas  but  heterozygous  for  yellow  peas  (RRYy),  how  many   different  phenotypes  are  their  offsprin ...
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... • Mendel crossed a true-breeding plant with round yellow seeds (RRYY) with a true-breeding plant grown from wrinkled green seeds (rryy) ...
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... phenotype which is totally different from both parents. This is an example of _____________________. 18. A situation in which a gene has more than 2 alleles is known as ______________________. 19. Blood type AB is an example of ___________________ (11-3 notes from today). 20. In fruit flies, multipl ...
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1 - OKBU.net
1 - OKBU.net

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1 - OKBU.net

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Reviewing Genotypes and Phenotypes Genotype describes the

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Topic 1 and 2 notes

... interpret patterns and trends of inheritance of traits and predict, quantitatively, the probability of inheritance of traits illustrated in  monohybrid, dihybrid and sex­linked inheritance, using pedigrees and Punnett squares  perform experiments to record and explain predicted phenotypic ratios ver ...
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Chapter 16: The Evolution of Populations and Speciation

... microevolution (change in genetic material of a population). Macroevolution (chapter 15) is change on a phenotypic level. • This is ONE equation they used: p + q = 1 where p = dominant allele where q = recessive allele p equals all of the alleles in individuals who are homozygous dominant (AA) and h ...
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... 7. The allele of the gene above is dominant and codes for red kernel pigment (it is designated as R). Another allele of this gene, the r allele (which is recessive), codes for white kernel pigment and is the result of a mutation in the R allele. In the r allele, the second nucleotide (base) in the s ...
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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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