An S1S2 ×S1S2 mating is performed. If the phenotypic ratio of the progeny is 3:1, then...            (Justify your answer)              A)   one allele is dominant and the other is recessive.                   B)   neither allele is dominant.             C)   the S1 allele is dominant to the S2 allele.             D)   the   S2 allele is dominant to the   S1 allele.             E)   the relationship between the alleles cannot be determined

Using the following allelic series A1>A2>A3>A4, indicate what would be the phenotype of a A1A3 heterozygote? O A) A1 phenotype O B) A3 phenotype C) both A1 and A3 phenotypes D) A2 phenotype

You cross true breeding blue and red morning glories and get all blue offspring. a) Based on this information alone: i) How many loci are involved in the expression of this trait? How many alleles? What are the dominant and recessive interactions between the alleles at the locus/loci? ii)what are the possible genotypes of the parents and F1s? iii) Based on your hypothesized genotypes from ii, what do you expect the outcome of a cross between the F1's to be? (i.e. what phenotypes in what ratios?)     b) You then cross the F1 individuals and you obtain the following results Blue - 200 purple - 126 red - 24 i) Are these results statistically consistent with your hypothesis above? (prove it!) ii) If not, what is an alternative hypothesis that might explain these results? Are these results the result of one locus or 2? Test your new hypothesis using chi-squared test. Discuss the meaning of your results. (Note: If your hypothesis proves wrong, that is OK!!! But you have to be able to discuss…

What is incomplete dominance? A) When one Allele produces the phenotypic expression. B) When two Alleles produce the phenotypic expression. C) When all Alleles produce the phenotypic expression.