A gel-like substance is placed in a glass dish on top of a heat plate turned on low. The substance at first does not move. You add five drops of water and wait two minutes.  All of the sudden, the substance begins to move around the glass dish.  You are not touching the heat plate, the glass dish, or the gel but it is definitely moving around the dish.  At times the gel-like substance seems to divide into two smaller blobs. You watch the gel until it eventually dries up and leaves only a crystal like structure in the bottom of the dish.

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

the answer

b.) bowling ball

answer; incomplete dominance;