For each of the genetic results described below, provide the term for the inheri
ID: 89736 • Letter: F
Question
For each of the genetic results described below, provide the term for the inheritance pattern that is most likely the cause and provide an explanation for your choice. Choose from:
Complete Dominance, Incomplete Dominance, Codominance, Multiple Alleles, Lethal Genes
-Six of the gerbils in a litter have white spotted fur and 3 have solid coloured fur.
-40 plants have red flowers, 41 have white flowers, and 79 have pink flowers. The pink flowers are clearly a lighter version of the red flowers.
-A blended family has 11 children. The children are the products of two previous marriages. There are four different phenotypes in the children for the same characteristic.
-A brown coloured cow has had four calves with a white bull. All of the calves have roan coloured hair. (Roan colour occurs when cattle has both red and white hairs in relatively equal amounts.)
-A grey mare had five foals with a grey stallion. Both horses were heterozygous for grey hair. The foals were all grey except for one that was chestnut in colour.
Explanation / Answer
Complete Dominance-explanation: In complete dominance, the effect of one allele in a heterozygous genotype completely masks the effect of the other. Here the allele for Grey color masks the allele for chestnut color and is said to be dominant to the latter, and the chestnut color allele that is masked is said to be recessive to the former.
A grey mare had five foals with a grey stallion. Both horses were heterozygous for grey hair. The foals were all grey except for one that was chestnut in colour.
Incomplete Dominance-explanation: Incomplete dominance is a type of Gene interaction, in which, in a heterozygous condition, both alleles of a gene at a locus are partially expressed, often resulting in an intermediate (or different) phenotype.
40 plants have red flowers, 41 have white flowers, and 79 have pink flowers. The pink flowers are clearly a lighter version of the red flowers.
Codominance- explanation:It is a form of dominance wherein the alleles of a gene pair in a heterozygote are fully expressed. This results in offspring with a phenotype that is neither dominant nor recessive.
A brown coloured cow has had four calves with a white bull. All of the calves have roan coloured hair. (Roan colour occurs when cattle has both red and white hairs in relatively equal amounts.)
Multiple Alleles-explanation: We inherit half of our genes (alleles) from our mother, & the other half from our father, so we end up with two alleles for every trait in our phenotype. An excellent example of multiple allele inheritance is human blood type. Blood type exists as four possible phenotypes: A, B, AB, & O.
A blended family has 11 children. The children are the products of two previous marriages. There are four different phenotypes in the children for the same characteristic.
Lethal Genes-explanation:Lethal genes are usually a result of mutations in genes that are essential to growth or development. Lethal alleles may be recessive, dominant, or conditional depending on the gene or genes involved.
Six of the gerbils in a litter have white spotted fur and 3 have solid coloured fur.
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