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Genetics I Study Guide
Biology
Name: _______________________
1. Study of how traits are passed __genetics_________________________
2. Two types of cells _body cells and sex cells___________________
3. Body cell has how many of each chromosome ___2_________________
4. Types of sex cells __can be either egg or sperm________________________
5. Sex cell has how many of each chromosome _1_____________________
6. Genes are passed to offspring when _sex_______ cells join
7. Two jobs of the nucleus __direct cell parts
allow cell to reproduce________
8. Where chromosomes are found __nucleus___________________________
9. Section of a chromosome __gene___________________________________
10. Gene that keeps other genes from showing trait ___dominant_____________
11. Recessive gene __genes that do not show traits in presence of dominant gene
12. Heterozygous _has a dominant and recessive gene for a trait_____
13. Mendel __reported results of genetic crosses in pea plants__
14. Short plants mated to short plants produce what type of plant _short_________
15. Write an example of a pure dominant gene __TT_________________________
16. Write an example of a pure recessive gene ___tt______________________
17. Write an example of a heterozygous gene __Tt___________________________
18. Two genotypes that show a dominant trait __homozygous dominant and
heterozygous
19. Phentotype the physical characteristics of an organism
20. Genotype the genes of an organism that refer to a trait
21. Punnett square _shows how genes combine when egg and sperm join ; shows
expected results__
22. Each box in a square represents _ a new organism______________________
23. Letters on the side and top represent _genes for one trait______________
24. Black fur is dominant to brown fur. Cross a pure recessive father with a
heterozygous mother. How many offspring will have Black fur? Brown fur?
B
b
b
Bb
Bb bb
b
Bb
Black fur: ___2______________
Brown fur: __2______________
Provide Genotypic ratio: 2Bb:2bb
Provide phenotypic ratio: 2 black:2 brown
bb