1 gram of fat give about how much kj of energy

37 kj

Explanation:

1 gram of fat = 9 kilocalories (kcal)

1 kcal = 4.2 kilojoules (kj)

4.2 kj/kcal * 9 kcal = 37.8 kj

1 gram of fat = 37.8 kJ

yes you are doing it right great gob

explanation:

"do a testcross with a homozygous recessive plant."