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
4.3: Genetic Mapping
- Define genetic mapping
A form of intermediate inheritance in which one allele for a specific trait is not completely dominant over the other allele.
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
MORE THAN TWOalleles control forparticular trait OF ACHARACTER
Coat Color in Rabbits Different combinations of two
alleles give different coat colors and pigment distributions.
Each chromosome carries a number of genes in
An additive effect of TWO or
MORE genes on a single
Eg; skin colour, body height
Polygene• Genetic map - A graphic representation of the arrangement
of a gene or a DNA sequence on a chromosome.
• 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