The highest tier in cell hierarchy is 1. cell 2. organ 3. tissue 4. organ system

4. organ system

Explanation:

The human body is made up of several organs and systems, which work together to ensure the perfect functioning of the organism. If we look at the microscopic level, we can perceive the presence of thousands and thousands of cells, which form tissues, even more cells form organs and even more cells form systems, a characteristic that allows us to affirm that human beings are multicellular organisms.

The main systems of the organism are: Integumentary System, Skeletal System; Muscular System; Cardiovascular System, Respiratory System, Digestive System, among others.

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.