Question
Incomplete dominance and Co$-$dominance.
| Incomplete dominance | Co-dominance |
| $1.$ Incomplete dominance is seen when the phenotypes of the two parents blend together to create a new phenotype for their offspring. | $1.$ Co$-$dominance is seen when the two parent phenotypes are expressed together in the offspring. |
| $2.$ Both the genes of an allelomorphic pair express themselves partially in $F_1$ hybrids. | $2.$ Both the genes of an allelomorphic pair express themselves equally in $F_1$ hybrids. |
| $3.$ In incomplete dominance, a mixture of the alleles in the genotype is seen in the phenotype. | $3.$ In co$-$dominance, both alleles in the genotype are seen in the phenotype. |
| $4.$ The phenotypic effect of one allele is more prominent than the other. | $4.$ The phenotypic effect of both the alleles is equally prominent. |
| $5.$ Blending or intermixing of two alleles can be observed. A white flower and a red flower alleles mix and produce pink flowers. Example : Pink flowers in Mirabilis jalapa. |
$5.$ No intermixing or blending effect of two alleles is observed. The colours don’t mix but are seen in patches. Example : Roan colour in cattle. |
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| Column A | Column B |
| (1) Frederick Griffith | (a) Test tube assay |
| (2) Avery, McCarty and MacLeod | (b) Streptococcus pneumoniae |
| (3) Alfred Hershey and Martha Chase | (c) E. coli |
| (4) Meselson and Stahl | (d) Bacteriophages |
| Water body A | Salinity values B |
| (1) Streams | (a) 340 ppt |
| (2) Indian Ocean | (b) 5 ppt |
| (3) Hyper saline lagoon | (c) 30-35 ppt |
| (4) Dead sea | (d) 100 ppt |
| Column A | Column B |
| (1) Organism | (a) Large unit with specific climatic zone |
| (2) Population | (b) Different species in particular area |
| (3) Community | (c) Same species in a geographical area |
| (4) Biome | (d) Basic unit of ecological hierarchy |