Download 6.5 Power notes - Issaquah Connect

SECTION
6.5
TRAITS AND PROBABILITY
Power Notes
CHAPTER 6
Meiosis and Mendel
Punnett Square grid system for predicting possible
genotypes resulting from a cross;
• Axes: represent possible gamete genotypes of each
parent;
• Grid boxes: show all possible
genotypes of offspring
Monohybrid cross: examines the inheritance
of one specific trait; students may
choose to sketch a Punnett square for a
specific cross
Ratios:
•predicted genotypic and phenotypic
ratios can be determined from a
Punnett square
•specific ratios will vary based on
example Punnett square used
Testcross: cross between an organism with the recessive phenotype (homozygous recessive
genotype) and an organism with the dominant phenotype but an unknown genotype; looking
at the offspring allows you to figure out the phenotype of the dominant organism
Dihybrid cross: examines the inheritance of
Ratios: predicted genotypic and
two traits; students may choose to sketch a
phenotypic ratios can be
determined from a Punnett
Punnett square for a specific cross
square;
specific ratios will vary based on
example Punnett square used
Copyright © McDougal Littell/Houghton Mifflin Company.
•
Law of independent assortment:
developed by Mendel as a result
of
• examining dihybrid
crosses; determined that the
inheritance of one trait does not
influence the inheritance of a
second trait
Probability: the likelihood that a particular event will happen; predicts the average
Number of occurrences; the distribution of genes in gametes and the fertilization
of a particular egg by a particular sperm are random events whose outcome can
be predicted with probability
Unit 3 Resource Book
McDougal Littell Biology
Power Notes
19