Question

CONTENT QUESTIONS (answer these for credit) 1. In an experiment to trace the inheritance of two traits in pea plants, a researcher decided to look at height, which is controlled by two alleles. The dominant allele T produces a tall plant while the recessive allele t produces a short plant. Flower color is controlled by one gene with two alleles as well. The dominant allele P produces purple flowers, and the recessive p produces white flowers. If the female parent pea plant has the genotype TUPp. A. List the possible genotypes of the gametes she (it) could produce? B. What would be the phenotype(s) of the F1 generation if the above female was pollinated by a male flower, TTpp 2. A cross between a true breeding red flowe, and a true-breeding white flower results in all offsprings having a pinkish color. What type of inheritance does this scenario depict? 3. In your own words, define the correct answer to question 2 above.

Answer 1

Ans 1 a) Formula of calculate number of gametes is 2ⁿ

Where n = Number of heterozygous traits

Here, TtPp has 2 heterozygous traits. Thus, 2² = 4 gametes will be formed. They are TP, Tp, tP, tp

Ans 1 b) When TtPp x TTpp we get,

50% Tall purple and 50% Tall white plants in F1 generation

Ans 2) When the cross between true breeding Red flowers and true breeding White flowers yield Pink flowers, this suggests Incomplete inheritance or blending inheritance.

Ans 3) In incomplete inheritance, we get deviation from the mendelian ratio. In incomplete inheritance we get

genotypic = phenotypic ratio i.e 1:2:1 after F1 pink flowers are self-crossed. Let's simplify it.For red colour, 100% protein is given by the genotype "RR" and for white colour 100% protein is given by the genotype "WW". But pink flower ("RW") has 50% protein from "RR" genotype and 50% of protein from "WW" genotype and thus shows the intermediate character or blending.