The resulting phenotypes are 75% flies with red eyes, curly wings, brown body, and legs on the head (R-C-B-L-) and 25% flies with white eyes, normal wings, yellow body, and antennae on the head (rrccbbll).
Experiment
- In this experiment, we are performing a cross between two individuals that are heter0zyg0us for all the traits under study.
- Each trait is coded by a single diallelic gene.
- We will assume they assort independently and there is no interaction between them.
TRAITS
wing shape
- Dominant allele C codes for curly wings,
- Recessive allele c codes for normal wings
bodycolor
- Dominant allele B codes for brown
- Recessive allele b codes for yellow
antenna type
- Dominant allele L codes for legs on the head
- Recessive allele l codes forantennae on the head
eye color
- Dominant allele R codes for red eyes
- Recessive allele r codes for white eyes
Cross
Parentals) RrBbCcLl x RrBbCcLl
Gametes) RCBL, rbcl RCBL, rcbl ⇒ No crossing over
Punnett square) RCBL rcbl
RCBL RRCCBBLL RrCcBbLl
rcbl RrCcBbLl rrccbbll
F1)
- 1/4 = 25% of the progeny is expected to be RRCCBBLL, expressing red eyes, curly wings, brown body, and legs on the head
- 2/4 = 50% of the progeny is expected to be RrCcBbLl, expressing red eyes, curly wings, brown body, and legs on the head
- 1/4 = 25% of the progeny is expected to be rrbbccll, expressing white eyes, normal wings, yellow body, and antennae on the head.
The resulting phenotypes are:
- 3/4 = 75% flies with red eyes, curly wings, brown body, and legs on the head.
- 1/4 = 25% flies with white eyes, normal wings, yellow body, and antennae on the head.
You can learn more about drosophila traits at
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