The document defines key genetic terms like genotype, phenotype, dominant and recessive alleles. It describes different inheritance patterns such as dominant-recessive, sex-linked, and codominance. As an example of codominance, it explains ABO blood groups which have three alleles - IA, IB, and i - where IA and IB are codominant so people can have blood type A, B, or AB if they contain both alleles.

1. Types of Inheritance
Lizzy Kim
Tuesday, 22 November 11 1

2. Assessment
Statements
4.3.1: Define genotype, phenotype, dominant
allele, recessive allele, codominant alleles,
locus, homozygous, heterozygous, carrier and
test cross
4.3.4: Describe ABO blood groups as an
example of codominance and multiple alleles
4.3.5-10
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3. Basic definitions
Genotype: the alleles of an organism
phenotype: the characteristics of an organism
Dominant allele: an allele that has the same
effect on the phenotype whether it is present
in the homozygous or heterozygous state
Recessive allele: an allele that only has an
effect on the phenotype when present in the
homozygous state
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4. Dominant -
Recessive
Phenotype of dominant alleles will show when
one or more allele is dominant
For recessive characters to show, both alleles
must be recessive
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5. Sex-linked
Some characteristics are linked on to the sex
chromosomes
Mostly, X chromosomes carry specific alleles
There could be sex-linked dominant and
recessive characteristics
Hemophiliac and color-blindness are the
commonly used examples of sex-linked
characteristics
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6. Codominant
There are two types of alleles at once
Both characters are shown when both
dominant alleles are present
Cows: When both black and white alleles are
shown they could be dotted
Flowers: When both red and white alleles are
shown they could be pink
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7. As: 4.3.4
Describe ABO blood
groups as an example of
codominance and
multiple alleles
There are three types of
alleles: I^A, I^B, i
A and B alleles are
dominant, i allele is
recessive (represents
blood type O)
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8. THANK YOU
TYPES OF
INHERIT-
ANCE
FYI, THEY ARE CODOMINANT!
DATE CREATOR
11.22.2011 LIZZY KIM
Tuesday, 22 November 11 8