Biology 2016 JAMB Past Questions - Question 12: If the cross of a red-flowered plant with a white flowered plant produces a pink flowered example of

Correct Answer

B

Explanation

Phenotype: All the plants produce pink flowers.this colour pink is a blend of the red and white colours. this is an example of incomplete dominance which is the ability of two contrasting alleles or genes to interact and produce a heterozygous. Phenotype which is quite differentfrom the two homozygous, in phenotypes none of the two alleles Is completelydominant over the other. The white and red colours are produced in the second generation.Phenotype: 1 homozygous reel flowered 2 pink flowered plants 1 homozygous white flowered plants Codominance occurs when the two genes or alleles in a heterozygous organism are dominant and are fully expressed in the phenotype e.g.in human blood group A.B, gene A and gene B have equal strength. Mutation is a sudden random change in the genetic materialof a cell that may cause it and ail cells derived from it to differ in appearance or behaviour from the normal type. Linkage is the tendency of two different ger.es on the same chromosome remain together during the separation-of homologous chromosomes at meiosis. Linkage can be broken by crossing over or by chromosome mutation when sections of chromosomes are exchanged and new combinations of genes are produced.