(PUC-Campinas 2009) - Question Medium of Biology

In a genetics experiment, a Biology teacher challenged his 3rd-year high school students to analyze a pea plant that exhibits two characteristics: seed color and seed texture. Seed color can be yellow (AA or Aa) or green (aa), and seed texture can be smooth (TT or Tt) or wrinkled (tt). These characteristics are determined by genes on different chromosomes, so they segregate independently, following Mendel's 2nd Law. The teacher challenges the students to determine the expected phenotypic and genotypic ratios in the F2 (second generation) of a cross between two plants that are heterozygous for both characteristics. Additionally, he asks the students to relate the concept of independent assortment to Mendelian inheritance principles. Based on this information: 1. Calculate the expected phenotypic and genotypic ratios in the F2 of the proposed cross. 2. Explain how the independent segregation of alleles for each characteristic relates to Mendel's 2nd Law and how this principle influences the determination of ratios in the F2.

From the stimuli sent by the sensory neurons, the central nervous system has as its main function to send information to the brain, which will process this information so that it can be properly responded to by the human body. What is the other main function of this system?

The circulatory systems of animals vary significantly depending on their complexity and physiological needs. Considering the different types of animals that exist, which of the following options correctly represents the circulatory system of an annelid, such as a earthworm?