Class Notes (809,198)
Canada (493,573)
York University (33,561)
Biology (2,145)
BIOL 1500 (75)
all (14)


2 Pages
Unlock Document

York University
BIOL 1500

BIOL 1500 MENDELIAN INHERITANCE June 12, 2012 Single gene trait Traits that are determined by the instructions a person carries on one gene. There are more than 9000 human traits that exhibit straightforward patterns of inheritance. Gregor Mendel conducted studies to help us understand how traits are inherited. 1) Chose garden pea to studypea plants are relatively easy to fertilize and produce hundreds of offspring from a single cross and could conduct enough experiments that lasted multiple generations 2) Chose easily observable and unambiguously identifiable traits (flower colour, pea shape and pea colour) 3) Repeatedly bred similar plants until he had many populations, unvarying for a particular traittrue breeding a. True breeding round pea plants always produced plants with round peas when crossed. b. True breeding purple-flowered pea plants always produced purple- flowered offspring 4) Cross breeding true breeding purple-flowered plants with true breeding white- flowered plants produce ALL purple offspring. 5) Then two of the purple-flower offspring (no longer true breeding) were crossed and produced mostly purple flowers but some white flowers. a. Therefore the dominant trait would be the purple-flower trait b. Therefore the recessive trait would be the white-flower trait Generally speaking, a dominant trait masks the effect of a recessive trait when an individual carries both the dominant and the recessive version of the instructions for the trait The existence of traits could disappear for a generation and then show up again down the line. Mendel’s hypothesis for explaining inheritance incorporated three ideas to make predictions about crosses he hadn’t done yet: 1) Each parent puts into every sperm or egg it makes a single set of instructions for building the trait (a gene) 2) Offspring receives two copies of the instructions for any trait a. Sometimes each parent contributes a s
More Less

Related notes for BIOL 1500

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.