QUESTION 12 In his original work on the genetics of garden peas, Mendel found th

Question

QUESTION 12

In his original work on the genetics of garden peas, Mendel found that yellow seed color (YY, Y_y) is dominant over green seeds (yy) and that round seed shape (RR, R_f) is dominant over shrunken seeds (rr). Mendel crossed pure-breeding (homozygous) yellow, round-seeded plants with green, shrunken-seeded plants. (a) What will be the genotype and phenotype of the F_1 produced from such a cross? genotype ____ phenotype ____ (b) If the F_3 plants are crossed, what will be the expected phenotypic ratio of the F_2 generation? The major blood groups in humans are determined by multiple alleles: that is there are more than two possible alleles, any one of which can occupy a locus. In this ABO blood group system, a single gene can exist in any of three allelic forms: I^A, I^B, or i. The alleles A and B code for production of antigen A and antigen B (two proteins) on the surface of red blood cells. Alleles A and B are codominant, while allele i is recessive. Four blood groups (phenotypes) are possible from combinations of these alleles (a) Is it possible for a child with blood type O to be produced by two AB parents? ___(yes or no) Explain. (b) In case of disputed paternity, the child is type O, the mother type A. Could an individual of the following blood types be the father?____ Explain each possibility. O___ A___ B____ AB____

Explanation / Answer

No, it is not possible to produce child with blood group O, by parents having blood group AB. Because AB parents not have recessive gene i that express for blood group O.

b) The father's possible blood group may be B, A or O. The blood group of child is O only possible when father must have at least one recessive allele I.e. i and this is possible when the father have genotype IA i, IBi or i i.

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