Answer:
Option B, Co-dominance
Explanation:
This is an example of codominance inheritance pattern.
When two alleles representing two different characteristic traits are expressed equally in the offsprings resulting from a cross, then this genetic inheritance pattern is called as codominance .
For example -
A red flower with genotype "RR" is crossed with a white flower "rr" resulting into pink color offsrping with genotype "Rr"
Here, both the red and white traits of flower color are expressed equally thereby giving pink color to the offspring flower.
The same thing is happening in case of true breeding black and white mice.
Hence, option B is correct
