GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
describes the genotype of a trait from parents to offspring from genetic information
|
|
|
the greater resemblance of offspring of to parents than to other individuals in the population
|
|
|
the case in which the the heterozygote has a phenotype intermediate between those of the two homozygotes
|
|
|
None of the above
|
Detailed explanation-1: -In incomplete dominance, the phenotype in a heterozygous individual is visibly less intense than that in an individual homozygous for the dominant allele, so that AA and Aa genotypes produce different phenotypes. Hence, the heterozygote (Aa) will have a phenotype intermediate between that of AA and aa individuals.
Detailed explanation-2: -This type of relationship between alleles, with a heterozygote phenotype intermediate between the two homozygote phenotypes, is called incomplete dominance.
Detailed explanation-3: -Incomplete dominance results from a cross in which each parental contribution is genetically unique and gives rise to progeny whose phenotype is intermediate. Incomplete dominance is also referred to as semi-dominance and partial dominance. Mendel described dominance but not incomplete dominance.
Detailed explanation-4: -However, sometimes the heterozygote displays a phenotype that is an intermediate between the phenotypes of both homozygote parents (one of which is homozygous dominant, and the other of which is homozygous recessive). This intermediate phenotype is a demonstration of partial or incomplete dominance.
Detailed explanation-5: -Codominance: the heterozygote shows some aspect of the phenotypes of both homozygotes. The expression of some genes can be influenced by the environment. The products of some genes interact with each other and influence the phenotype of the individual.