Terminology
Name the correct term for: alternative form of a gene
What are those two forms?
Allele
Dominant and Recessive
Our traits are
Red flowers (R) and white flowers (r)
Rr x Rr
What is the probability that the offspring will be white?
What is the probability the offspring will be red?
75%
What law is represented by Tt x Tt
Law of dominance
What is the difference between incomplete and codominance?
Incomplete: alleles blend
Codominance: both alleles expressed
What mode of inheritance only affects males?
Y-Linked
Give an example
Genotype
Ex. AA (homozygous dominant), Aa (heterozygous), aa (homozygous recessive)
What is the phenotypic ratio for the following cross
Round seeds (R) wrinkled seeds (r)
RR x rr
4 round : 0 wrinkled
or 1
State all three of Mendel's laws
Law of dominance
Law of Segregation
Law of Independent Assortment
What is blood type an example of?
What is the most common blood type? Is it dominant or recessive?
Blood type O (ii)
Recessive
Name at least 4 modes of inheritance.
Autosomal Recessive
Autosomal Dominant
X-linked Recessive
X-linked Dominant
Y-linked
Incomplete Dominance
Codominance
Name the correct term for: all of an organisms genetic material.
Genome
What is the genotypic ratio for the following cross:
Pod Color: Green (G) Yellow (g)
Gg x Gg
1 GG : 2 Gg : 1 gg
What type of cross accurately shows the law of independent assortment?
Dihybrid Cross
Complete the following cross (incomplete dominance)
Blue (B) Grey (b) Heterozygous (bluish grey)
Bb x bb
50% Bluish grey
50% Grey
In these types of pedigrees, one parent must be affected for a child to have the condition.
Autosomal Dominant
Name the correct term for: the stronger of two genes expressed in a hybrid
What is the correct term for a hybrid?
Dominant
Heterozygous
For the following cross state the probability for each offspring:
Tall (T) short (t)
Tt x tt
50% Tt= tall
50% tt= short
What is the common phenotypic ratio for the law of independent assortment?
9: 3: 3: 1
Say a mom is heterozygous blood type A and a dad is homozygous blood type B:
would it be possible for their child to have homozygous blood type B? What about blood type AB?
Homozygous blood type B: not possible
Blood type AB: 50% chance
What type of pedigrees shows dad always transmitting the condition to the daughter?
X-linked dominant
Name the correct term(s) for:
the passing of traits from parent to offspring
&
the study of heredity
Heredity
&
Genetics
Axial (A) terminal (a)
AA x Aa
Genotypic- 2 AA : 2 Aa or 1 AA : 1 Aa
Phenotypic- 4 Axial : 0 Terminal or 1
Which law suggests that 1 allele from each parent is passed on to offspring during meiosis?
Law of segregation. (Principle of Segregation)
What is meant by the term polygenetic traits? Give an example.
"many genes"
Several genes influence a trait
Ex. Eye color, height, weight, hair color
When analyzing a pedigree we must remember a rule called assumption. What does this rule state?
for rare traits unaffected people entering a family (e.g. marriage) are considered homozygous normal