{"id":2002,"date":"2020-07-17T11:30:28","date_gmt":"2020-07-17T11:30:28","guid":{"rendered":"https:\/\/murreeroad.org\/Biology10\/?p=2002"},"modified":"2020-07-19T07:46:54","modified_gmt":"2020-07-19T07:46:54","slug":"q-11-define-and-explain-co-dominance-and-incomplete-dominance-with-examples","status":"publish","type":"post","link":"https:\/\/murreeroad.org\/Biology10\/q-11-define-and-explain-co-dominance-and-incomplete-dominance-with-examples\/","title":{"rendered":"Q.11 Define and explain co-dominance and Incomplete dominance with examples."},"content":{"rendered":"

Q.11 Define and explain co-dominance and Incomplete dominance with examples.<\/strong>
\nAnswer:<\/strong>
\nCo-dominance <\/strong>
\nIt is a situation where two different alleles of a gene pair express themselves completely instead of showing dominant-recessive relationship. As a result, heterozygous organism shows phenotype that is different from both homozygous parents.
\nExample<\/strong>
\n ABO Blood Group<\/strong>
\nGene I <\/strong>
\nThe ABO blood group system is controlled by gene I.
\n Alleles<\/strong>
\nGene I has three alleles:
\n(a) IA
\n(b) IB
\n(c) I
\nAllele 1A\u00a0<\/strong>
\nAllele IA produces antigen A in blood and the phenotype is blood group A.
\nAllele IB <\/strong>
\nAllele IB produces antigen B in blood and phenotype is blood group B.
\n\"\"
\nAllele i <\/strong>
\nAllele i does not produce any antigen and the phenotype is blood group 0. Complete Dominance
\nAllele IA and I are completely dominant over allele i.
\nGenotype. IA IB\u00a0<\/strong>
\nIn heterozygous genotype IA IP, each of the two alleles produces the respective antigens and neither of them dominates over the other. So blood group will be AB.
\nIncomplete Dominance <\/strong>
\nIt is a situation where in heterozygous genotypes, both the alleles express as a blend (mixture) and neither allele is dominant over the other. As a result of this blending, an intermediate phenotype is expressed.
\n\"dom\"
\nFour O Clock plant<\/strong>
\nFlower colour <\/strong>
\nThe trait of flower colour is controlled by two alleles i.e. ‘R’ and ‘r’..
\nAllele ‘R’ <\/strong>
\nAllele ‘R’ is responsible for giving red colour to flower.
\nAllele ‘r’ <\/strong>
\nAllele ‘r’ is responsible for giving white colour to flowers.
\nTrue Breeding Plants <\/strong>
\nTrue breeding plants ‘RR’ and ‘rr’ have red and white coloured flowers respectively.
\nHeterozygous plants of F1 Generation <\/strong>
\nWhen homozygous red flowered plant (RR) is crossed with homozygous white flowered plar (rr), the heterozygous (Rr) plants of F1 generation produce pink flowers.
\nBlending <\/strong>
\nPink colour is blend of red and white colours.
\nF2 Generation <\/strong>
\nWhen two heterozygous plants with pink flowers (Rr) are crossed, F2 generation shows phenotype of red, pink and white flowers in the ratio 1:2:1.
\nConclusion <\/strong>
\nThus, it is concluded that neither of red flower allele (R) and white flower allele (r) is dominant.
\n\"gen\"
\n\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Q.11 Define and explain co-dominance and Incomplete dominance with examples. Answer: Co-dominance It is a situation where two different alleles of a gene pair express themselves completely instead of showing dominant-recessive relationship. As a result, heterozygous organism shows phenotype that is different from both homozygous parents. Example ABO Blood Group Gene I The ABO blood… Read More »Q.11 Define and explain co-dominance and Incomplete dominance with examples.<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[26],"tags":[],"_links":{"self":[{"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/posts\/2002"}],"collection":[{"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/comments?post=2002"}],"version-history":[{"count":3,"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/posts\/2002\/revisions"}],"predecessor-version":[{"id":2009,"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/posts\/2002\/revisions\/2009"}],"wp:attachment":[{"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/media?parent=2002"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/categories?post=2002"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/murreeroad.org\/Biology10\/wp-json\/wp\/v2\/tags?post=2002"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}