QUESTION 3 Biended inheritance is supported by which genetic discovery O incompl

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QUESTION 3 Biended inheritance is supported by which genetic discovery O incomplete dominance O gene linkage O independent assortment o codominance QUESTION 4 1 points Save Answer Crossing over during meiosis violates the prediction of O gene linkage O segregation o XY sex determinism O codominance QUESTION 5 1 points Save Answer Phenotypes that have a range of variability (not discrete differences such as Mendel's pea flower color), are typically a resuit of O polygenic inheritance O independent assortment O gene linkage

Explanation / Answer

3. Incomplete dominance. In blended inheritance the traits of a progeny are intermediate between those of parents. In incomplete dominance none of the two alleles is completely dominant over the other i.e unable to completely mask the efect of other allele. The resultant progeny has a phenotype which is a blend of both alleles. In four O' clock plants incomplete dominance in flower colour is observed. When red flowered parent is crossed with white flowered parent, the resulting progeny has the phenotype: red, pink and white flower. Pink flower are produced when progeny is heterozygous for red and white colur allele. None of the two alleles show complete dominance over the other leading to a blended pink coloured phenotype.

4 Gene linkage. Genes are said to be completely linked i.e they are transferred to progeny together when there is no crossing over/recombination between them. When crossing over takes place gene gene linkage is broken.

5. Polygenic inheritance. Traits which have range of variability are known as quantitative traits eg.. body weight,milk production, mature plant height, kernel colour of wheat ( dark red to white). These unlike mendelian traits ,also called qualitative traits ,do not have two different phenotypic extremes. Qualitative traits are controlled by only one or a few genes. On the other hand quantitative traits are governed by multiple genes (polygenes) at different loci. Each gene contribute a little to the phenotype and effect is additive, which makes it difficult to determine effect of one single gene. In addition to polygenes, some environmental factors also affect quantiative traits.

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