3.2 PRINSIP & MEKANISME PERWARISAN SIFAT

GEN DOMINAN & GEN RESESIF

GEN DOMINANGEN DOMINAN

Gen kuat yang dapat melindungi ciri gen resesif yang berpasangan

dengannya

GEN DOMINANGEN DOMINAN

Ditandakan dengan huruf besar

GEN DOMINANGEN DOMINAN

Ciri-ciri dominan ditonjolkan disebabkan kehadiran sepasang gen dominan atau

salah satu daripadanya

GEN RESESIFGEN RESESIF

Gen lemah yang hanya menonjolkan ciri-cirinya jika gen itu berpasangan

sesamanya

GEN RESESIFGEN RESESIF

Ditandakan dengan huruf kecil

GEN RESESIFGEN RESESIF

Ciri-ciri resesif ditonjolkan disebabkan kehadiran kedua-dua gen resesif

CONTOH SIFAT DOMINAN & SIFAT RESESIF PADA MANUSIA

GENOTIP DAN FENOTIP

Genotypic combination Phenotype (hair texture)

CC (homozygous) Curly hair

Cc (heterozygous) Curly hair

cc (homozygous) Straight hair

GREGOR JOHANN MENDELGREGOR JOHANN MENDEL

Saintis pertama yang mengkaji kebakaan secara sistematik

Exercise 1

Figure shows the inheritance of height in plants.a) If T represents the dominant allele for tallness & t the recessive

allele for dwarfness, complete the information given in the figure.b) If the F1, generation plants are self-pollinated, draw a genetic

diagram to find out the percentage of the offspring of F2 generation that would be a tall plant

• What is the probability of Rr X Rr producing wrinkled seed?

• What is the probability of Yy X yy producing green seed?

MENDELIAN TRAITS IN HUMANS

Is it possible for a brown-eyed parents to have a blue-eyed child??