Evaluation

1
OVERHEAD S
Dihybrid Genetic Problems (2 non-linked genes, 4
alleles)
In Mendel's second experiment, he studied the
effect of inheritance one trait has on another.
Mendel concluded that the alleles of one gene
segregated independently from another. That is,
one trait does not affect the inheritance of
another. He called this The Law of Independent
Assortment
Evaluation
2
Metaphase 1
3
Types of Gametes Produced
P AaBb
4
OVERHEAD T

• In pea plants, the genes for seed color and seed
  texture have two alleles A for yellow and a
  for green and B for smooth and b for
  wrinkled. If I cross a pea plant heterozygous
  for seed color and texture with itself
• What are the different gametes produced?
  (F.O.I.L.)
• What will the phenotypic ratio be for the F1
  offspring (seeds)?
• What will the genotypic ratio be for the F1
  offspring (seeds)?
• What is the probability that you will have yellow
  F1 offspring (seeds)?
• If I cross this same plant with a homozygous
  recessive plant (a testcross individual) what
  will be the probability of getting heterozygous
  offspring? Yellow offspring?

5
OVERHEAD T
Consider three yellow round peas, labeled A, B,
and C. Each was grown into a plant and crossed
to a plant grown from a green wrinkled pea.
Exactly 100 peas coming from each cross were
sorted into phenotypic classes as follows Cross
A 51 yellow round, 49 green round Cross B 100
yellow round Cross C 24 yellow round, 26
yellow wrinkled 25 green round, 25
green wrinkled What are the genotypes of A, B,
and C? Use symbols of your own choosing.
B
A
C