Genic Interactions stripes (S). Ifan animal carries a dominant C but two recessi

Question

Genic Interactions stripes (S). Ifan animal carries a dominant C but two recessive ss, pigment will be cvenly and the mouse will be black. Ifit carries two recessive cc, no pigment will and it will be white. Ifit carries a dominant C and a dominant, S, it will be striped lelowing problems deal with genic interactions where two or more gene pairs interact to effect one trait. mice the allele that produces pigment (C) is epistatic to the one that distributes the pig- ment in The following cross was mades Phenotypes Black × White Genorypes CCssX CCSS Gametes Cs All of the offspring were striped and their genorypes we mice and determine the phenotypic ratios for the next generation. flowers. One gene, C, produces CeSs Cross two of these striped the an enzyme that converts this raw material into purple pigment. have a dominant Cand a dominant P in order to be purple. All o example of complimentary genes is found in sweet pea raw material for a purple pigment pigment irse nt (not the pigment itrself) and another gene, P produces refore, a plant must 12. An Ihe ther combinations are white Parental cross: (purple) whice) FI generation CePp parple) Diagram an FI dihybrid cros and determine the phenotypic ratio of the F2 generation. produce of bud r type of genic interaction is called collaboration. In this case, two genes interact to four different phenotypes. An example of collaboration occurs in the feather colors gies. Genotype B,yy Phenotype bb Y_ " Yellow B Y....Green byyWhite (A dash indicates that the second allele can be either dominant or recessive.) A blue budgie having the genotype Bbyy is mated to a yellow bird having the genotype bbYy. What is the phenotypic ratio of their offspring? 14. Multiple genes or polygenes are responsible for such traits as height or skin color. An individual has many genes that contribute to the same trait. An example of multiple genes or polygenes i 94 Exercise 12 | Genetic Problems

Explanation / Answer

Answer 11

Gene C encodes the enzyme that leads to the distribution of pigment evenly and results in the development of black colour mouse but only in absence of S gene and in presence of ss recessive alleles form of the stripe gene.

CCss : Black

ccSS : White

CcSs : Stripe

Cross between two striped mice: CcSs X CcSs

From the above table, we can observe the phenotypic ratio is : 9 (Striped) : 4 (White) : 3 (Black)

Answer 12

Purple colour pigment appears only when dominant alleles of both genes are present. When one or both genes have only recessive alleles, the colour will be white.

From the question, we observed that the pathway is responsible for the purple colour pigment synthesis. In this, colourless precursor molecule must be acted on by two different enzymes to produce the purple pigment. Gene C encodes a functional enzyme that converts colourless precursor to raw material.

Finally, gene P encodes an enzyme which gives purple colour by converting raw material to purple colour pigment.

From the table, we can observe the phenotypic ratio of F2 generation is 9 (Purple) : 7 (White)

Answer 13

BByy or Bbyy : Blue

bbYY or bbYy : Yellow

BbYy or BBYY or BbYY or BBYy: Green

bbyy : White

Cross between Blue budgie and yellow bird:

Bbyy X bbYy

From the table, we can observe that phenotypic ratio is: 1 (Green) : 1 (Blue) : 1 (Yellow) : 1 (White)

CS Cs cS cs CS CCSS (Striped) CCSs (Striped) CcSS (Striped) CcSs (Striped) Cs CCSs (Striped) CCss (Black) CcSs (striped) Ccss (Black) cS CcSS (Striped) CcSs (Striped) ccSS (White) ccSs (White) cs CcSs (Striped) Ccss (Black) ccSs (White) ccss (White)

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