genetic inheritance€¦ · - define types of inheritance that deviate from mendelian 4.3: genetic...
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GENETIC
INHERITANCE
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subtopi
cs
Mendelian
Genetics
(C1)
Deviations From The
Mendelian Inheritance
(C1)
Genetic
Mapping
(C1)
4.1
4.2
4.3
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Learning
outcomes
4.1: Mendelian Gene
a)Define the terminologies
b)State the characteristics of Mandel’s pea plants
c)State Mendel’s first law
d)State Mendel’s second law
4.2: Deviations from the Mendelian Inheritance
- Define types of inheritance that deviate from
Mendelian
4.3: Genetic Mapping
- Define genetic mapping
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Deviations from the
Mendelian inheritance
Codominant alleles
Incomplete
dominant alleles
Multiple alleles
Linked genes
sex-linked genes
polygenes
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Both alleles of a
pair are fully
expressed in a
heterozygote.
Codominant Allele
Roan coat color:
Both alleles are
equally expressed
in the heterozygot
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A form of intermediate inheritance in which one allele for a specific trait is not completely dominant over the other allele.
Incomplete dominant
allele
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Snapdragons show incomplete dominance in the inheritance of
flower color. The heterozygous flower has a phenotype that is in
between that of the two homozygotes
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MORE THAN TWOalleles control forparticular trait OF ACHARACTER
Multiple allele
Coat Color in Rabbits Different combinations of two
alleles give different coat colors and pigment distributions.
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Each chromosome carries a number of genes in
particular locus
Linked gene
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Genes that are
carried by either
sex chromosomes
( X or Y) are said to
be Sex-Linked
Sex- Linked gene
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An additive effect of TWO or
MORE genes on a single
phenotypic character
Eg; skin colour, body height
Polygene
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GENETIC MAPPING
Polygene• Genetic map - A graphic representation of the arrangement
of a gene or a DNA sequence on a chromosome.
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GENETIC MAPPING
Polygene
• genetic mapping - Process of locating the relative
position & sequence of gene on a chromosome.
• Can be carried out when the genes are linked and
crossing over has taken place
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Than
k
you