GENETIC

INHERITANCE

Subtopics

Mendelian

Genetics

(C1)

Deviations From The

Mendelian Inheritance

(C1)

Genetic

Mapping

(C1)

4.1

4.2

4.3

Learning

outcomes

4.1: Mendelian Gene

a)Define the terminologies used in genetic inheritance

b)State the characteristics of Mandel’s pea plants

c)State Mendel’s first law

d)State Mendel’s second law

e)Construct genetic diagram

4.2: Deviations from the Mendelian Inheritance

- Define types of inheritance that deviate from

Mendelian

4.3: Genetic Mapping- Define genetic mapping

heterozygous

homozygous

genotype

phenotype

dominantAllele

Selfcross

gene

Terminologies Used In

Genetic Inheritance

Test

cross

recessive Locus

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Alleles

Alternative forms of a gene for a trait

occupying the same locus on

homologous chromosomes

Terminologies Used In

Genetic Inheritance

Genes

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Alleles

Terminologies Used In

Genetic Inheritance

A heritable unit consisting of a

specific nucleotide sequence in DNA

that controls a specific characteristic

or phenotype of an organism

Genes

Locus

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Alleles

Terminologies Used In

Genetic Inheritance

The position on a homologous

chromosome where a gene is

located

Genes

Locus

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Alleles

Terminologies Used In

Genetic Inheritance

Genotype • Genetic composition of an

individual; combination of alleles it

possesses.

• or the alleles possessed by an

individual

.

Genes

Locus

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Alleles

Terminologies Used In

Genetic Inheritance

Genotype

Phenotype• The observable characteristics of

an organism.

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Homozygous

Terminologies Used In

Genetic Inheritance

An organism that has a pair of

identical alleles for a gene.

HeterozygousAn organism that has TWO

different alleles for a gene.

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Homozygous

Terminologies Used In

Genetic Inheritance

Heterozygous

Dominant allele

Recessive allele

• An allele which express its

phenotype even in heterozygous

form.

• An allele that only express its

phenotype when present in the

homozygous form.

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Test cross

Terminologies Used In

Genetic Inheritance

Individual of unknown genotype with

dominant phenotype is crossed to a

recessive homozygous individual

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Test cross

Terminologies Used In

Genetic Inheritance

Transfer of the pollen grain from the

anther to the stigma of either the

same or genetically similar flowerSelf crosss/

self pollination

Characteristics Of

Mendel’s pea plants

Easy to

grow

Short life

cycle/mature

quickly

Produce large

number of

offspring from

each mating

Many easily

observable

characteristics

Pea plants can

self-pollinate

or cross-

pollinate

Characteristics Of

Mendel’s pea plants

Mendel’s LAW FIRST

LAW

The TWO alleles

for a heritable

character

SEGREGATE

during gamete

formation & end up

in different

gametes.

Mendel’s SECOND

LAW

Each PAIR of

alleles

SEGREGATES

INDEPENDENTLY

of each other pair

of alleles during

gametes

formation.

Thank

you