Genetics, Molecular Biology and Evolution-Quantitative Genetics [IFS (Forest Services) Botany]: Questions 1 - 6 of 8

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Question 1

Appeared in Year: 2018

Describe in Detail Subjective▾

What is polyembryony? how՚s it induced? Discuss its applications.

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Explanation

Polyembryony

  • After the fertilization, the ovules mature into the seeds. In a normal situation one embryo is present in the each seed. But sometimes more than one embryo is present in a seed. This condition is called polyembryony.
  • The presence of more than one embryo in the seed is called polyembryony.
  • In nature there are some plants which have more th…

… (293 more words) …

Question 2

Appeared in Year: 2019

Describe in Detail Subjective▾

Discuss the structure and function of synaptonemal complex, mentioning its location. State the different structural types of DNA with outline sketches.

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Explanation

In Meiosis

  • During prophase I in zygotene stage.
  • The pairing of homologous chromosome takes place.
  • Homologous chromosome which comes from the mother and father are attached towards each other and their pairing take place.
  • That pairing is called synapsis.
  • Synapsis begins at more than one point along the length of the homologous chromosome.
  • 3 types of synap…

… (117 more words, 10 figures) …

Question 3

Appeared in Year: 2018 (IAS)

Describe in Detail Subjective▾

Gray seed colour in peas is dominant over the white. In the following experiments, parents with known phenotypes but unknown genotypes produced the following progeny:

Table Supporting: UPSC IAS Botany Optional: CS Main Exam-Botany Paper II – 2018, Section-A
ParentsProgeny
GrayWhite
Gray X White8278
Gray X Gray11839
White X White050
Gray X White740
Gray X Gray900
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Explanation

Using the letter G for gray and g for white, give the genotype of each parent.

  • GG = Grey (Dominant)
  • Gg = Grey (Intermediate)
  • gg = White (Recessive)
Table Supporting: UPSC IAS Botany Optional: CS Main Exam-Botany Paper II – 2018, Section-A

… (231 more equations) …

Question 4

Appeared in Year: 2018 (IAS)

Describe in Detail Subjective▾

Explain the concept of multiple alleles with one example.

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Explanation

The allele is the alternate version of a gene. These alleles are in charge of the variance in how a certain attribute is expressed phenotypically, such as the distinction between brown and green eyes. A gene can have two or more alleles. Every gene is inherited twice, once from each parent. As a consequence, a characteristic would have two unique a…

… (508 more words, 3 figures) …

Question 5

Appeared in Year: 2022 (IAS)

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Explain the phenomenon of incomplete dominance and its significance.

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Explanation

Incomplete Dominance: A monohybrid cross of a red-flowered snapdragon (Antirrhinum majus) with a white flowered variation did not generate red or white flowered plants in , despite mendelism. Instead, the blossoms are pink, indicating a middle ground between the two parents. This is because neither red nor white flower color is …

… (297 more words) …

Question 6

Appeared in Year: 2022 (IAS)

Describe in Detail Subjective▾

Write a short note: Multiple factor hypothesis (Paper II)

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Explanation

Mendel՚s laws of heredity provide a straightforward and correct explanation of qualitative differences among plants and animals, such as blossom color (red or white) and seed color (yellow or green) . However, many characteristics, such as weight, height, and IQ in men, are quantitative rather than qualitative.

Other key characteristics in cultivate…

… (574 more words) …