Verified answer

Non-Mendelian Mode of Inheritance

1. Genotype for black chicken: BB

  Genotype for white chicken: WW

  Genotype for erminette chicken: BW

2. Phenotype of a plant with the genotype RR : red flower

   Phenotype of a plant with the genotype WW : white flower

   Phenotype of a plant with the genotype RW : pink flower

3. Parents: RR x WW

   In this cross, it will produce 100% or RW which is pink flowers

   NOTE: See attached for the Punnett Square

Explanation:

Genotype and Phenotype

Genes are instructions in our DNA that encode specific traits. They come in different forms. The alternate forms of genes for a specific trait are called alleles. Alleles come in pairs for a specific trait - one allele comes from the father and the other one from the mother. The combination of alleles for a specific trait can be found in a genotype. Genotype can be homozygous or heterozygous. Homozygous genotype is made up of the same type of alleles while heterozygous genotype is made of two different alleles. A phenotype is an individual's observable traits, such as color of flower, blood type, or height.

Codominance

Codominance is a mode of inheritance wherein neither of the alleles is recessive. Thus, in this mode of inheritance, both alleles are expressed in their phenotype. Like in feather color of some chickens (item 1), it is expressed by codominance. The genotype BB will produce black feathers, and WW will produce white feathers. For the heterozygous genotype, BW will produce erminette which is a combination of black and white feathers.

Incomplete Dominance

Incomplete dominance is another mode of inheritance wherein alleles are not expressed as dominant or recessive. Instead, an intermediate phenotype is produced. This intermediate phenotype is usually the blend of the two traits. It is also referred to as partial dominance or intermediate inheritance. For item 2, the four o'clock flower color exhibits incomplete dominance. The genotype, RR, produces red flowers and WW produces white flowers. However, the heterozygous genotype, RW, will produce an intermediate phenotype which is pink.

Punnett Square

Punnett square is used to show all possible allelic combinations of the cross of parents with known genotypes in order to predict the probability of their offspring possessing certain sets of alleles.

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