Bio. 203 Lecture 3 and 4 RSA 1-26 -09

Bio. 203 Lecture 3 and 4 RSA 1-26 -09 - Chromosomes...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Walther Flemming Chromosomes contain the units of heredity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Walter Sutton 1902 Sutton Bovery Hypothesis Chromosomes contain the units of heredity Mendel's particles parallel the behavior of chromosomes at meiosis 1913 Elinor Carothers heteromorphic chromosome pair in Grasshoper
Background image of page 2
Thomas Hunt Morgan 1910 Morgan noticed one fruit fly with a distinctive characteristic: white eyes instead of red. Red XXR X XXr white F 1 Red dominant F2 Females: XR XR , XR Xr red-eye female Xr X r white-eyed females F2 Males : XR Y red-eye male Xr Y white-eyed male
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1922 Alfred Blakeslee 12 stains each containing a different extra chromosomes and 12 different appearances. Jimsonweed
Background image of page 4
F 1  x F 1 F 2   Ratio 3:1 Dihybrid cross: F2 Ratios = 9:3::3:1
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Probability What is the chance that a given event will occur? what is the chance that a child, or a family of children, will have a given phenotype? Probability - expressed in numbers between 0 and 1. Probability = 0 means the event never happens probability = 1 means it always happens. The total probability of all possible event always sums to 1.
Background image of page 6
Chance deviation from an expected outcome is diminished by larger sample size .
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The Multiplication and Addition Rules The multiplication rule probability that two or more independent events will occur together is the product of their individual probabilities. The addition rule States that the probability that any one of two or more exclusive events will occur is calculated by adding together their individual probabilities
Background image of page 8
The Multiplication Rule States that the probability that two or more independent events will occur together is the product of their individual probabilities.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Laws of probability Help Explain Genetic Events Genetic rations are most properly expressed as probabilities - 3/4 tall:1/4 dwarf. These values predict the out come of self fertilization of F1 for one pair of contrasting alleles. × Rr Segregation of alleles into eggs Rr Segregation of alleles into sperm R r r R R R R 1 2 1 2 1 2 1 4 1 4 1 4 1 4 1 2 r r R r r Sperm × Eggs
Background image of page 10
The rule of addition States that the probability that any one of two or more exclusive events will occur is calculated by adding together their individual probabilities
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Conditional Probability When one event depends on another, the likelihood of the desired outcome is the conditional probability. Example: In a monohybrid cross DD X dd. What is the probability that a tall plant is heterozygous? Pc = Pa/Pb Pa : p of heterozygous Pb: p of a plant being tall Pc= (1/2)/(3/4)=2/3
Background image of page 12
In a family of four children, what is the probability of having 2 boys and 2 girls? B1
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/03/2009 for the course BIOLOGY 2203 taught by Professor Anthwal during the Spring '08 term at Temple.

Page1 / 47

Bio. 203 Lecture 3 and 4 RSA 1-26 -09 - Chromosomes...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online