4 Genetics - types of inheritance (by Lizzy)
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Transcript of 4 Genetics - types of inheritance (by Lizzy)
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Types of InheritanceLizzy Kim
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Assessment Statements4.3.1: 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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Basic definitionsGenotype: 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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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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Sex-linkedSome 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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CodominantThere 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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As: 4.3.4Describe 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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TYPES OFINHERIT-ANCE
DATE CREATOR11.22.2011 LIZZY KIM
THANK YOUFYI, THEY ARE CODOMINANT!
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