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LESSON N26
THEME: Interactions between non-allelic genes. Pleiotropy. Expressivity. Penetrance.
Task 1. Solve the tasks that modeling interaction between non-allelic genes.
1. Height is quantitative (polygenic) trait in humans. Height is controlled by three pairs of genes,
located in different chromosomes. A very tall person has 6 recessive genes (alala2a2a3a3) and
very shot person has 6 dominant genes (A1A1A2A2A3A3). What is the genotype of a medium-
height person?

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?

Explain how light energy is turned into chemical energy? ! due tomorrow!