B. They compare traits that species have
# 1. Carbohydrates
# 2. Lipids
# 3. Proteins and Amino Acids
# 4. Isoprenoids and Pigments
Ans. (B). XX, XY ,XX, XY ,XY, XX .
In pigs, the XY-sex determination system is found. According to this system, sex of the organisms can be determined by the presence of a pair of sex chromosomes.
Females have two X chromosomes (represented by XX), and known as homogametic sex, while males have one X and one Y chromosomes (represented by XY), and known as heterogametic sex.
Thus, the correct answer is option (B).
