Thursday, January 20, 2011

GENETIC INHERITANCE : Cross That Deviate From Mendelian Inheritance

Baiklah marilah kita teruskan dengan beberapa lagi cross yang tersisih daripada Mendelian Inheritance, mean larilah dan xmematuhi pun mononybrid ke dihybrid ke atau law of segregation and law of independent assortment..ini sudah lain yer..
baiklah kita ada Codominant Alleles, Incomplete Dominant Alleles, Multiple alles, Polygenes dan Lethal Alleles and Link Genes.


Sengaja buat yang besar dan yang kecil. Yang besar tu maksudnya selalu menjadi tajuk untuk keluar exam dan yang kecil tu kureng~ dan kita belajar pun sikit je, so just go to the definition~~

Codominant Alleles
2 alleles are codominant when both alleles are fully expressed in heterozygous form.
(contohnya mcm ABO Blood Group)

Genotypic and phenotypic ratio = 1:2:1

Incomplete Dominant Allele
Maksudnya "one allele is not fully dominant over its partner, so in heterozygous condition, total product is intermediate between that of dominant and recessive alleles".


So genotypic and phenotypic ratios = 1:2:1


Multiple Alleles
"One gene having more than two alleles OR all alleles control the same character"

contohnya macam ABO blood tyepe in human.
ada 3 different alelles: IA , IB  &  I .



BLOOD A boleh jadi : IAIA II

  BLOOD B: IBIB @ IBI

BLOOD AB IAIB

BLOOD O : II

Polygenes
Poly = banyak
so mean polygenic inheritance, a characteristics is controlled by many genes.
~cukup~


Lethal Alleles

Lethal alleles is a allele that may cause death
2 types: - dominant lethal gene (cause death even in heterozygous condition)
               - recessive lethal gene (cause death only in homozygous condition)

~diagram nanti yer~






1 comment:

  1. tkar lh nmer blog... bio n our life.... bru kner hahahahaha..

    ReplyDelete