Tag: botany

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Questions Related to botany

Multiple choice botany mendel's law of inheritance genetics terminology similarities and dissimilarities in organisms introduction to genetics features of human body and sign language

When a cross is made between a tall plant with yellow seeds (Tt Yy) and a tall plant with green seeds (Tt yy), what is true regarding the proportions of phenotypes of the offsprings in F1 generation?
Proportion of Tall and Green         Proportion of Dwarf and Green 

  1. $\dfrac{3}{8}$ $\dfrac{1}{8}$
  2. $\dfrac{2}{8}$ $\dfrac{1}{8}$
  3. $\dfrac{1}{8}$ $\dfrac{3}{8}$
  4. $\dfrac{2}{8}$ $\dfrac{2}{8}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Crossing TtYy x Ttyy: The Tt x Tt cross gives 3/4 Tall and 1/4 Dwarf. The Yy x yy cross gives 1/2 Yellow and 1/2 Green. Tall and Green = (3/4) * (1/2) = 3/8. Dwarf and Green = (1/4) * (1/2) = 1/8.

Multiple choice botany mendel's law of inheritance genetics terminology similarities and dissimilarities in organisms introduction to genetics features of human body and sign language

A tall plant was grown in nutrient deficient soil and remained dwarf. When it is crossed with dwarf plant then

  1. all hybrid plants are dwarf

  2. all hybrid plants are tall

  3. depend upon genotype of a tall plant

  4. 75% tall and 25% dwarf
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A tall plant was grown in nutrient deficient soil and remained dwarf .So , after crossed with dwarf plant then all hybrid plants are tall. Hybrid genotype is Tt.

Hence, correct option is B. 

Multiple choice botany mendel's law of inheritance genetics terminology similarities and dissimilarities in organisms introduction to genetics features of human body and sign language

In Drosophila, the allele for a normal grey body colour G is dominant to ebony body g. The following table summarises the results of several crosses.


S. No. Cross Result
1. strain 1*gg all wild-type
2. strain 2*gg 1 wild type: 1 ebony
3. strain 3*gg all ebony
4. strain 4*Gg 3 wild type:1 ebony


Which strain both have the genotype Gg?

  1. 1 and 3

  2. 1 and 4

  3. 2 and 3

  4. 2 and 4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The first cross between strain 1 and gg result in all wild-type offspring, it must have genotype GG. As in that case, all offspring will have Gg genotype hence showing wild-type character. Similarly, strain 3 must have genotype gg resulting in all ebony bodied offspring.


While, strain 2 and 4 have genotype Gg. 

Cross for strain 4*Gg can be shown as:-

 Gamete type  G  g
 G  GG  Gg
 g  Gg  gg

Here, it can be seen that offspring have 3 wild type:1 ebony as grey body ( wild type ) colour G is dominant. 


Cross for strain 2*gg can be shown as:-
| Gamete type |  g |  g | | --- | --- | --- | |  G |  Gg |  Gg | |  g |  gg |  gg | Here, it can be seen that offspring have 1 wild type: 1 ebony as grey body ( wild type ) colour G is dominant. So, the correct option is '2 and 4'.

Multiple choice botany option b: biotechnology and bioinformatics dna transfer rdna technology - dna transfer and transformation biotechnology in agriculture

In biolistic method of gene transfer, the microparticles coated with foreign DNA are bombarded into target cells at a very high velocity. These microparticles are made up of

  1. Silver or Tungsten

  2. Arsenic or Silver

  3. Gold or Tungsten

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Biolistic method or gene gun method is a direct or vectorless method of introducing DNA into cells that involves bombardment of cells with high-velocity microprojectiles coated with DNA. In biolistic method, tungsten or gold particles, coated with foreign DNA are bombarded into target at a very high velocity.
So, the correct answer is 'Gold or tungsten'.
Multiple choice botany option b: biotechnology and bioinformatics dna transfer rdna technology - dna transfer and transformation biotechnology in agriculture

Which of the following techniques can be used to introduce foreign DNA into the cell?

  1. Using disarmed pathogen

  2. Microinjection

  3. Gene gun

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vectors, gene gun ( biolistic ) and microinjection are all viable techniques to insert foreign DNA into the host cell. So, the correct option is All of these.

Multiple choice botany option b: biotechnology and bioinformatics dna transfer rdna technology - dna transfer and transformation biotechnology in agriculture

Electroporation is

  1. Making transient pores in cell membranes to introduce gene constructs

  2. Fast passage of nutrients through phloem sieve pores by electric stimulation

  3. Opening of stomata by artificial light during night

  4. Purification of saline water with the help of membrane system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electroporation is a technique used in molecular biology to create temporary pores in cell membranes using an electrical pulse, allowing foreign DNA or other molecules to enter the cell.

Multiple choice botany option b: biotechnology and bioinformatics dna transfer rdna technology - dna transfer and transformation biotechnology in agriculture

Genes can be inserted into human cells by

  1. PCR

  2. Xenotransplantation

  3. Modified viruses

  4. Modified microarrays
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Modified viruses (viral vectors) are commonly used in gene therapy to deliver therapeutic genes into human cells because of their natural ability to infect cells.

Multiple choice botany option b: biotechnology and bioinformatics dna transfer rdna technology - dna transfer and transformation biotechnology in agriculture

Find the odd one among the following methods of rDNA transfer into host cell.

  1. Biolistics

  2. Gene gun

  3. Microinjection

  4. Retroviral vector
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There are various methods of making the host cell competent for transformation with Recombinant DNA technology.

Microinjection method is one where the recommended DNA is directly injected into the nucleus of the animal cell. In the gene gun method, the bombardments on plant cell with high-velocity microparticles of gold or tungsten coated with DNA is done which is known as biolistic or gene gun.
The pathogen vectors are allowed to infect the cell and transfer the recombinant DNA into the host cell which is known as the retroviral vector method.
So, the correct option is 'Biolistics'.