Dominant Gene:- Is one that shows its effect in the phenotype in both homozygous and heterozygous conditions.
Recessive Gene:- A gene that only expresses itself when in homozygous conditions.
Homozygous Vs Heterozygous
Homozygous refers to two identical alleles found on the same chromosome while heterozygous refers to alleles that are unidentical.
Mono-hybrid Inheritance:
Types of mono-hybrid inheritance:
Complete Dominance
- Complete Dominance:- This is where the dominant gene shows its effect more in the phenotype (75% in offsprings to be exact).
Characteristics of Complete Dominance:
- Phenotypic ratio->> 3:1
- Genotypic ratio->> 1:2:1
- Both parents possess the same genotype and are heterozygous.
Incomplete Dominance/Codominance
In incomplete dominance each allele has the ability of expressing itself to some extent when in the heterozygous condition. This is because of intermediate alleles, which are alleles which lask dominant and recessive relationship.
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4 Response to Genetics- genes & alleles
Genetics and inherited and non inherited traits are absolutely fascinating. It's incredible to realize that such little pieces of information have such an impact in our complexion, intelligence, inherited traits and so on. Thanks a lof for explaining things so clearly and didactically.
thanks for commenting mariana
This is the course that I have really had a hard time during college.
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