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During the studies on genes in Drosopila...

During the studies on genes in Drosopila that were sex-linked T.H. Morgan found F2-populabon phenotypic ratios deviated from expected 9 : 3 : 3 : 1. Explain the conclusion he arrived at.

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**Step-by-Step Solution:** 1. **Understanding the Experiment:** - T.H. Morgan conducted experiments on Drosophila (fruit flies) to study inheritance patterns. He performed a dihybrid cross between two different strains of fruit flies: one with yellow bodies and white eyes (female) and another with brown bodies and red eyes (male). 2. **F1 Generation:** - The offspring (F1 generation) from this cross exhibited a phenotypic ratio that differed from the expected Mendelian ratio of 9:3:3:1, which is typical for a dihybrid cross involving two independent traits. ...
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During the studies on genes in Drosophila that were sex-linked T.H. Morgan found F2-population phenotypic ratios deviated from expected 9 : 3 : 3 : 1. Explain the conclusion he arrived at.

Morgan carried out several dihybrid crosses in Drosophila and found F_(2) -rations deviated very significantly from the expected Mendelian ratio. Explain his findings with the help of and example.

Assertion : When yelow bodied, white eyed Drosophila females were hybridised with brown-bodied, red eyeed males , and F_(1) progeny was intercrossed, F_(2) ratio deviated from 9:3:3:1 Reason : When two genes in a dihybrid are on same chromosome, the proportion of parental gene combinations are much higher than the non-parental type

In a typical monohybrid cross the F_(2) -population ratio is written as 3:1 for phenotype but expressed as 1:2:1 for genotype. Explain with the help of an exmaple.

In a typical monohybrid cross the F_(2) -population ratio is written as 3:1 for phenotype but expressed as 1:2:1 for genotype. Explain with the help of an exmaple.

Define epistasis and give one example of this phenomenon. How is the phenotypic ratio of F_2 generation in epistasis different from the normal 9:3:3:1 ratio?

During the investigation of an archeological dig, a femour bone was found and used to estimate the height of the person it came from using the formula h=61.4+2.3F , where h is the height , in centimeters, of a person whoe femour is F centimeters in length. Using this formula, the height of the person was estimated to be 5 feet 8 inches. The length of the femour, in centimeters, was closet to which of the following lengths? [Note: 1 inch=2.54 centimeters]

Morgan hybridised yellow-bodied, white-eyed females to brown-bodied red-eyed males and intercrossed their F_(1) progeny. He observed that (a) F_(2) ratio was deviated very significantly from the 9:3:3:1 ratio (b) Both genes did not segregate independently of each other (c) Recombinant types are not obtained in F_(2) generation (d) Both genes segregate independently of each other Select the correct set of statements :

A true breeding tall plant is crossed with a true breeding dwarf plant. F_1 progeny is 100% tall and F_2 has tall: dwarf in the ratio 3: 1. Name the patterns of inheritance in which the ratio deviates from the above. Also, mention the deviated phenotypic ratio.

Give a genetic explanation for the following cross. When a tall pea plant with rounds seeds was crossed with a dwarf pea with wrinkled seeds then all the individual of F_(1) -populations were tall with round seeds. However selfing among F_(1) -population led to a 9:3: 3:1 Phenotypic ratio.

XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-SECTION-C
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