Question

The total number of offspring from a monohybrid cross was found to be 600 and the expected phenotypic ratio was 1:2:1. For the purposes of a X2-test, what would the calculated values of E be?

Answer 1

150 AA, 300 Aa and 150 aa

Step-by-step explanation:

The expected phenotypic ratio of 1:2:1 means that we expect:

• 1/4 of the offspring to be AA
• 2/4 of the offspring to be Aa
• 1/4 of the offspring to be aa

If the total number of offspring was 600, then the E values would be:

• 1/4 × 600 = 150 AA

• 2/4 × 600 = 300 Aa

• 1/4 × 600 = 150 aa