Class Notes (834,408)
Canada (508,508)
HMB265H1 (242)

Notes taken during lecture

6 Pages
Unlock Document

Human Biology
Stephen Wright

rd LECTURE 14 March 3 Quantitative traits = complex traits Variation in average differences in genotypes between individuals AND environmental variation that gives phenotypic variation Environmental variation because of food, climate, illnesses, etc. Maristic traits class of discrete traits Discrete traits either or traits; single-gene traits MARISTIC TRAITS: Whole-number range of values possibilities are not infinite Ex. number of progeny Additive inheritance and incomplete dominance Additive gene action in heterozygote, exactly intermediate of the two homozygotes o This occurs with additive effects Incomplete dominance is example of additive gene action o Heterozygote has trait value or state that is intermediate quantitatively between the two homozygous classes but NOT EXACTLY INTERMEDIATE o This occurs because of environmental variation Mutations in few genes cause familial hypercolesteremia Still single-gene diseasedisorder Because any one of the many genes is mutated can result in this Heterozygotes Blurring of lines o Genotypically heterozygote but phenotypically homozygous can result because of environmental influence TODAYs lecture quantitative trait analysis Phenotype = E and genotype How much is due to genetic variation? Broad sense extend of phenotypic variation that is attributed to genetic variation, all types of genetic variation Can be quantified by Hsquared (representing broad sense) Vp = Vg + Ve Values range between 0 and 1 o There is no env effect if 1 all variation caused by genetic effects
More Less

Related notes for HMB265H1

Log In


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.