EXERCISE 12
GENETIC INHERITANCE PROBLEMS
OBJECTIVES
Note:
A lleles
locus
P 1 generation
F 1 g eneration
Note:
Genetics Inheritance Problems
Instructions: Work in lab groups to count kernels and solve the genetics problems. Materials: Genetic corn cobs with kernels, calculator
1. CROSS # 1: corn kernels (seeds)
purple
yellow
F1 p lants that all had purple corn kernels
Po generation:
Genotype F1
The F1 corn plants with the purple corn kernels were interbred
2
F1 cross:
F2 generation:
e xpected F2
expected percentage
P rocedure: The F2 c ontainer in the lab labeled F2 of
C ross 1 observed
TABLE 1: Phenotypes of Corn Kernels for F2 Generation of Cross 1 (observed data)
6
4
2
2
TABLE 2: Observed and expected data for F2 generation of Cross 1
2
2. CROSS # 2: F1 purple corn kernels with yellow corn kernels.
F
F1
F2 generation:
e xpected F2
expected percentage
Procedure: of cross 2.
observed
TABLE 3: Phenotypes of Corn Kernels for F2 Generation of Cross 2 (observed data)
6
4
2
observed expected.
TABLE 4: Observed and expected data for F2 generation of Cross 2
