Homework SourseIs the number of genes studied in a dihybrid cross the same
Solution
Is the number of genes studied in a dihybrid cross the same as the number studied in a monohybrid cross?
Answer : No
monohybrid cross: it is a mating between two individuals with different alleles at one locus.
It is a cross between two parents possessing a pair of contrasting characters (one ).
Round genotype RR x wrinkle genotype rr
Round Rr
R
R
r
Round Rr
Round Rr
r
Round Rr
Round Rr
All offspring are round
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dihybrid cross
It is a cross between 2 parents possessing TWO pair of contrasting characters
dominant allele ----F ----------------r purple color
and
recessive allele f ----------------------------- white color
dominant allele H -------------------- height
and
recessive allele h, ------------------------- a dwarf pea plant
purple & height Ff Hh x purple & height Ff Hh
F H
F h
f H
f h
F H
F H F H
F H F h
F H f H
F H f h
F h
F h F H
F h F h
F h f H
F h f h
f H
f H F H
f H F h
f H f H
f H f h
f h
f h F H
f h F h
f h f H
f h f h
Phenotypic ration of Offspring
Are in 9:3:3:1
phenotype
ratio
purple & height
9/16
purple & dwarf
3/16
white & height
3/16
White & dwarf
1/16
| R | R | |
| r | Round Rr | Round Rr |
| r | Round Rr | Round Rr |
