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