Lecture 3 Flashcards Preview

Genetics > Lecture 3 > Flashcards

Flashcards in Lecture 3 Deck (10):
1

Probability of rolling a 4 twice in a row?

Probability of rolling a 3 or a 4?

1/36

1/3

2

If probability of being blood type A is 1/8 and the probability of blood type O is 1/2 what is the probability of being type A or O?

A. 5/8
B. 1/2
C. 1/8
D. 1/16

A.

3

Conditional probability

The probability of an event A, given that event B has already occurred

4

A cross btw 2 heterozygous parent plants. What is probability that a tall offspring plant is homozygous?

Tt X Tt = 1/4 TT + 1/2 Tt + 1/4 tt

BUT tt cannot take place bc looking ONLY at tall offspring plants
= 1/3 TT + 2/3 Tt

Probability that tall offspring will be TT = 1/3

5

Binomial expression

p+q=1
(p+q)^n

p=freq of one outcome
q=freq of another outcome
n=number of events

6

Review lecture 3 slide 34 (albinism/binomial expression)

NOW

7

Di hybrid cross

Examining two traits at same time

8

What principle do di hybrid crosses reveal?

Principle of independent assortment

9

In a dihybrid cross, would crossing over change the relationship of the 2 diff genes in the offspring?

No, traits on diff chromosomes will sort independently

***principle of independent assortment

10

Probability

Way to mathematically describe the likelihood of the occurrence of a particular event