1. INTRODUCTION TO GENETICS
CHAPTER 10
INTRODUCTION TO GENETICS

2. Karyotype- male or female?

3. Karyotype- Male or female?

4. Homeosis

5. 1. What are traits?
Physical Characteristics- phenotype

6. 2. What controls each trait?
A. A gene pair= genotype.
B. Environment

8. 3. WHAT ARE GENES?
a.deoxyribonucleic acid
b.Make Proteins
c.turned on/off by proteins

9. 4. What are different forms of a gene?
Ans. alleles.

10. 5. Who first studied genetics?
Person- Gregor Mendel (a monk)
Year- 1822

11. 6. What species did Mendel study?
Pea Plants
True bred-
(2 identical alleles)

13. 7. Why were true breeding plants important for Mendel’s experiments?
Ans. inheritable patterns easier to see.

14. 8. How did Mendel study genetics?
fertilized a tall plant with short plant
Parents (P): tall plant X short plant.
Offsprings (F1 generation): all tall!

15. 9. What two conclusions did Mendel draw?
A. a factor is passed from one generation to the next.
B. Principle of Dominance:some alleles are dominant over others.
Not dominant allele= recessive

16. 10. What symbols are used for the 2 alleles?
Example – height in plants.
A.Dominant-Tall = use capital letter T
B. Recessive- short =use lower case letter t

17. 11. What genotypes can a plant with a tall phenotype have?
TT = homozygous dominant
Tt = heterozygous dominant

18. 12. What genotypes can a phenotype short plant have?
Tt = homozygous recessive

19. Genotype and Phenotype lab
Ear Lobes:
Phenotypes possible- free hanging or attached to side of head.

20. What is your genotype?
Free hanging- dominant= E
Genotype: EE or Ee
Attached- recessive= e
Genotype: ee

21. WIDOW’S PEAK