A dihybrid test cross is made between genes J and M. Four categories of offspring are produced: JM, Jm, jM, and jm. You wish to use the X2 test to test the hypothesis that the J and M genes are unlinked. How many degrees of freedom would there be in this test?

explanation:

they can be good for the ecosystem

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.