Question

below is data for 250 offspring mice, as produced in a laboratory.

	predicted fraction	predicted percentage	laboratory fraction	laboratory percentage
black fur and red eyes	3/16	18.75%	51/250	20.4%
white fur and black eyes	3/16	18.75%	44/250	17.6%
white fur and red eyes	1/16	6.25%	20/250	8.0%

notice that the predicted percentages and laboratory percentages are not the same. these differences most likely result from

a computation error
a wrong linkage between the genes
expected randomness
an unusual sample

Explanation:

In genetics experiments with offspring (like the 250 mice here), differences between predicted and observed (laboratory) percentages/fractions are typically due to expected randomness in genetic inheritance and sampling. A computation error would be a one - off miscalculation, wrong linkage is a more serious genetic issue (unlikely here as it's a standard offspring data), and an unusual sample is too extreme. Expected randomness (due to chance in which alleles are passed on) is the most likely cause of small differences between predicted and observed genetic - related offspring traits.

Answer:

expected randomness