Pre-Test Genetics

#1 Which of these causes VARIATION in offspring?

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

#3 What did Gregor Mendel study? GARDEN PEAS

#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

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

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

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

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

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

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

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

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

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