Question

Table 1. Observed number of Bog Turtles of each genotype in 2017 Genotype Observed number in 2017 15 AB AC 32 + 3 20 25 BC The Bog Turtle (Glyptemys muhlenbergii) is a semi-aquatic turtle in the family Emydidae. Individuals are easily identified by the yellow-orange blotches on each side of their necks. Scientists discovered that this phenotypic trait is controlled by a single locus with three alleles (assume a negligible mutation rate). The number of turtles with each genotype is shown in Table 1. Last year (2017), the region contained a single, panmictic population of 100 turtles and was geographically isolated from all other populations. Thanks to substantial conservation efforts, 162 turtles were captured this year (2017). What is the expected number of turtles for each genotype? Show all your work. Table 1.pdf

Answer 1

If negligible mutation rates exist, it signifies that the heritability of this trait follows mendelian laws and would give rise to distinct ratios.

The data is given for 100 turtles with a constant ratio of genotype
Using unitary method we can determine the Genotype distribution of 162 turtles.

For example,
For AA we have 5 turtles showing this genotype in every 100
So in 162 turtles we will have: (5/100) X 162 = 8.1
So approximately 8 turtles show this genotype.

Similar calculations can be done for all genotypes

Genotype	True Value	Rounded off Value
AA	8.1	8
AB	24.3	24
AC	51.84	52
BB	4.86	5
BC	32.4	32
CC	40.5	41

The total number for the rounded up values comes out to be 162