orn In this section you will examine the inheritance of two independent characte

Question

orn In this section you will examine the inheritance of two independent characters in corn. The first is colour, which we have already examined. The second is kernel composition. Kernels may be starchy (dominant) or sugary (recessive). Starchy kernels have a smooth appearance and sugary kemels appear crystalline and wrinkled. A true-breeding (homozygous) plant with purple, starchy kernels was crossed with a true-breeding (homozygous) plant with yellow, sugary kernels to produce an Fi population. Q12. Using appropriate symbols for the dominant and recessive alleles, what is the genotype of each parent, and what is the expected phenotype and genotype of the F1? Q13. Use a Punnett square to determine the expected genotypes, expected phenotypes, and expected percentages of phenotypes in the F2 generation when two F1 plants are crossed. Summarize your results in the table below Expected Expected Expected Phenotypic s) Q14. The com cobs provided represent the actual numbers found in the F2 generation of the cross you did above. Count six rows of kernels from the cob provided and record your results in the following table. These values represent the observed number of kernels for the four possible phenotypes. Observed # of kernels Purple, starchy Purple, sugary Yellow, starchy Yellow, sugary TOTAL

Explanation / Answer

P1 PPSS X ppss

(Purple startchy) (yellow sugary)

Gametes PS PS ps ps

F1 PpSs (Purple Starchy)

phenotypic ratio 9:3:3:1

PS Ps pS ps PS PPSS PPSs PpSS PpSs Ps PPSs PPss PpSs Ppss pS PpSS PpSs ppSs ppSs ps PpSs Ppss ppSs ppss

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