Non Mendelian Inheritance

Detablan, SherenMangilit, Michaella Kristiane

AAPD2B

Non Mendelian Inheritance

A general term that refers to any pattern of inheritance in which traits do not segregate in accordance with Mendel’s laws.

Incomplete Dominance

A form of intermediate inheritance in which one allele for a specific trait is not completely dominant over the other allele. This results in a combined phenotype.

INC

OM

PLE

TE D

OM

INA

NC

E A cross pollination between red and white snap dragon plants

Co-Dominance

A cross between organisms with two different phenotypes produces offspring with a third phenotype in which both of the parental traits appear together.

CO

-DO

MIN

AN

CE Co-dominance in roan cattle color: white, redand mixed

Multiple Allelism

A set of three or more alleles, or alternative states of a gene, only two of which can be present in a diploid organism.

MU

LTIP

LE A

LLELIS

M The ABO blood group

Other Non Mendelian Genetics

Maternal Effect

The genotype of mother directly determines phenotype of offspring. Explained by the accumulation of gene products mother provides to developing eggs

MATER

NA

;L EFFE

CT Dextral (D) is dominant to sinistral (d)

Epigenetic Inheritance

Modification occurs to a nuclear gene or chromosome. This occurs during spermatogenesis, oogenesis, and early stages of embryogenesis

Types of Epigentic Inheritance

Dosage Compensation: Males and females of many species have different numbers of certain sex chromosomes

Genomic Imprinting: involves the physical marking of a segment of DNA

TYPES

OF E

PIG

EN

ETIC

IN

HER

ITAN

CE

Right: Dosage Compensation; Left: Genomic Imprinting

Extranuclear Inheritance

The transmission of genes that occur outside the nucleus. It is found in most eukaryotes and is commonly known to occur in cytoplasmic organelles such as mitochondria and chloroplasts or from cellular parasites like viruses or bacteria

EX

TR

AN

UC

LEA

R IN

HER

ITAN

CE Pigmentation of Mirabilis jarapa

End