By Tamarin R.H.

ISBN-10: 0072325305

ISBN-13: 9780072325300

ISBN-10: 0072334207

ISBN-13: 9780072334203

ISBN-10: 0072334215

ISBN-13: 9780072334210

ISBN-10: 0072334231

ISBN-13: 9780072334234

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A geneticist crossed two corn plants, creating an F1 decahybrid (ten segregating loci). He then selffertilized this decahybrid. How many different kinds of gametes did the F1 plant produce? What proportion of the F2 offspring were recessive homozygotes? How many different kinds of genotypes and phenotypes were generated in the F2 offspring? What would your answer be if the geneticist testcrossed the decahybrid instead? 27. Consider the following crosses in pea plants and determine the genotypes of the parents in each cross.

16. Thus, with complete dominance, a self-fertilized dihybrid gives a 9:3:3:1 phe- notypic ratio in its offspring (F2). A 1:2:1:2:4:2:1:2:1 genotypic ratio also occurs in the F2 generation. If the two genes exhibited incomplete dominance or codominance, the latter would also be the phenotypic ratio. What ratio would be obtained if one gene exhibited dominance and the other did not? 17. Tamarin: Principles of Genetics, Seventh Edition 30 II. Mendelism and the Chromosomal Theory 2. 2 verwhelming evidence gathered during this century has proven the correctness of Mendel’s conclusions.

Mice with dominant alleles of both genes (A-C-) will have the agouti color, whereas mice that are homozygous recessive at the A gene (aaC-) will be black. So, at the A gene, A for agouti × aa bb cc × Self ABC ABc AbC Abc aBC aBc abC abc ABC AA BB CC AA BB Cc AA Bb CC AA Bb Cc Aa BB CC Aa BB Cc Aa Bb CC Aa Bb Cc ABc AA BB Cc AA BB cc AA Bb Cc AA Bb cc Aa BB Cc Aa BB cc Aa Bb Cc Aa Bb cc AbC AA Bb CC AA Bb Cc AA bb CC AA bb Cc Aa Bb CC Aa Bb Cc Aa bb CC Aa bb Cc Abc AA Bb Cc AA Bb cc AA bb Cc AA bb cc Aa Bb Cc Aa Bb cc Aa bb Cc Aa bb cc aBC Aa BB CC Aa BB Cc Aa Bb CC Aa Bb Cc aa BB CC aa BB Cc aa Bb CC aa Bb Cc aBc Aa BB Cc Aa BB cc Aa Bb Cc Aa Bb cc aa BB Cc aa BB cc aa Bb Cc aa Bb cc abC Aa Bb CC Aa Bb Cc Aa bb CC Aa bb Cc aa Bb CC aa Bb Cc aa bb CC aa bb Cc abc Aa Bb Cc Aa Bb cc Aa bb Cc Aa bb cc aa Bb Cc aa Bb cc aa bb Cc aa bb cc Trihybrid cross.

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Principles of Genetics by Tamarin R.H.


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