Quantitative Traits

Question 1

discrete and categorical , such as presence or absence of a particular structure or the state of a color

Answer 1

qualitative traits

Question 2

continuous characters such as height weight

Answer 2

quantitative traits

Question 3

quantitative traits in humans, such as height have what kind of distribution?

Answer 3

sex-linked bimodal

Question 4

qunatitative traits are determined by a combined influence of (2)

Answer 4

1- genotype at many different loci
2- the environment

Question 5

nicotine longiflora

Answer 5

tobacco flower

Question 6

as loci for determining flower length of tobacco increased, so did the

Answer 6

number of possible genotypes and phenotypes

Question 7

east demonstrated that quantitative traits are determined by the combined influence of

Answer 7

mendelian behaving alleles at many loci

Question 8

even plants of the same genotypes could vary in flower length and other characteristics, this is the influence of

Answer 8

environment

Question 9

one of the “holy grails” of evolutionary biology is to determine the

Answer 9

gens and loci responsible for phenotypes

Question 10

QTL (quantitative trait loci)

Answer 10

portions of the genome that influence quantitative traits

Question 11

methodological approaches to scanning or screening chromosomes in order to identify genes contributing to particular quantitative traits

Answer 11

QTL mapping

Question 12

when m lewisii and m cardinals are interbred, what happens?

Answer 12

an intermediate flower morph is present

Question 13

5 4 steps of QTL mapping

Answer 13

1. choose species of interest
2. choose and store phenotypic traits of interest
   3 make crosses , large number of F2 gneration
3. identify markers (loci) from across the species genome
4. compare individual variation in phenotype with individual variation marker at loci
5. infer which markers are associated with various phenotypes