Instead of thymine, RNA Polymerase pairs the nucleotide base with adenine.

Uracil

Explanation:

DNA and RNA are both nucleic acids with similar structures, but they have a few key differences.

RNA is primarily single stranded, whereas DNA forms a double-stranded helix.

The sugar backbone in a DNA molecule is deoxyribose, whereas in RNA it is ribose.

The nucleotides that make up DNA molecules are adenine, thymine, cytosine, and guanine, whereas nucleotides that make up RNA are slightly different, adenine, uracil, cytosine, and guanine.

In DNA, adenine pairs with thymine, and guanine pairs with cytosine.

In RNA, adenine pairs with uracil, and guanine pairs with cytosine.

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.