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Saturday Study Session 2
Theme of the day:
Information Transfer
Session 4 - Mendelian Genetics
Question 1 Answer
A
Clue: Highest percentage
of Roan = Rr
Question 2 Answer
D
Clue: recessive = must be
homozygous recessive
Question 3 Answer
B
Clue: all traits are
homozygous and
opposites
Question 4 Answer
C
Clue: two different genes
affect one trait
Epistasis
BbCc
BbCc
Sperm
1
1
1
1
1
4
BC
1
4
bC
1
4
1
Bc
4
bc
4
BC
BBCC
BbCC
BBCc
BbCc
4
bC
BbCC
bbCC
BbCc
bbCc
4
Bc
BBCc
BbCc
BBcc
Bbcc
4
bc
BbCc
bbCc
Bbcc
bbcc
9
16
3
16
4
16
Dihybrid – Normal 9:3:3:1 ratio
Question 5 Answer
C
Clue: AB; but both
parents are B
Codominance (AB) &
Multiple Alleles
Question 6 Answer
B
Clue: one gene with
several phenotypic
effects
Pleiotropy (Sickle Cell)
Math Grid In Answer
• The correct answer is: 1/32
Father – A a B b C c D d
  

Mother -A a B B c c D d
Desired - A a B B
Cc dd
#arrows = 2/4 2/4 2/4
¼
Reduce ½ x ½ x ½ x ¼ = 1/32
Short Free Response 1
(4 points possible)
• Possible points awarded for:
Discussion of this being an X-linked trait (1pt.)
Discussion of the trait “skipping a generation”
(1 pt.)
Discussion of only males being affected and
females being shown as carriers. (1 pt.)
Discussion of a female inheriting two recessive
alleles; one on each of her twoX
chromosomes. (1pt.)
Pedigree
Short Free Response 2
(3 points possible)
Possible points awarded for:
Stating the order of genes being: vg-cn-rb-b
(1 pt.)
Discussion of the highest frequency being
farthest apart. (1 pt.)
Discussion of lowest frequency being closest
together. (1 pt.)
Crossover frequencies