1. Pre-Test
Genetics

2. #1
Which of these causes VARIATION in offspring?

3. #2
What is happening in the picture below? Does it happen during MITOSIS or MEIOSIS?
CROSSING OVER----MEIOSIS
What does it INCREASE?
GENETIC VARIABILITY

4. #3
What did Gregor Mendel study?
GARDEN PEAS

5. #4
If I have two wrinkled seed pea plants (rr) and two round seed pea plants (RR), and all the offspring are round, what PRINCIPLE are you observing?
THE PRINCIPLE OF DOMINANCE

6. #5
Classify the following as homozygous dominant, homozygous recessive, or heterozygous. AA Aa aa
Are these GENOTYPES or PHENOTYPES?
Homozygous dominant
Heterozygous
Homozygous recessive

7. 1 AA : 2 Aa : 1 aa Or 1:2:1 A a A AA Aa a Aa aa #6
What is the genotypic ratio resulting from the cross Aa x Aa?
1 AA : 2 Aa : 1 aa Or
1:2:1 A a A AA Aa a Aa aa

8. #7
From the cross below, how many offspring will have the same GENOTYPE as their parents?
50 %

9. #8
What trait will ALL offspring have from the cross below?
GREEN FEATHERS G g G GG Gg G GG Gg

10. #9
What is the PHENOTYPE of person II, 2?
NORMAL

11. #10
Male or female?
Mutations?
Trisomy 21
caused by
NON-DISJUNCTION

12. inversion translocation
#11
Deletion, duplication, inversion, or translocation?
inversion
translocation

13. 4/16 or 1/4 #12 = 2/4 Tt x 2/4 Yy Dihybrid Cross: TTYy x Ttyy
How many offspring will be TTYy? =
4/16 or 1/4
2/4 Tt x
2/4 Yy

14. NON-DISJUNCTION can cause
#13
A mutation in gametes would be passed on to who?
OFFSPRING (Children)
For example,
NON-DISJUNCTION can cause
a monosomy or trisomy
in offspring