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 offspring in \[{{F}_{1}}\] generation?
Assume that you are trying to insert a gene from human DNA into a plasmid and someone gives you a preparation of human DNA cut with restriction endonuclease A. The human gene you are studying has sites on both ends for restriction endonuclease B. You have a plasmid with a single site for B, but not for A. Your best strategy would be to:
A)
Cut the plasmid with restriction endonuclease A and insert the human DNA cut with restriction endonuclease B into the plasmid.
doneclear
B)
Cut the plasmid twice with restriction endonuclease B and ligate the two fragments onto the ends of the human DNA fragments cut with restriction endonuclease A.
doneclear
C)
Cut the human DNA again with the restriction endonuclease B and insert these fragments into the plasmid cut with the same enzyme.
doneclear
D)
Cut the plasmid with restriction endonuclease A and insert the human DNA cut with restriction endonuclease A into the plasmid.
The development of the current idea that DNA is the genetic material was first demonstrated by Griffith in his famous experiment using smooth and rough strains of Pneumococci. DNA was then called as "transforming principle". Consider the
following experiment in this connection:
Steps:
(i) Pneumococci of smooth strains were first grown on culture media.
(ii) Cells were separated and lysed to collect cell free extract. '
(iii) "Transforming principle" was isolated from the extract and distributed into two test tubes.
(iv) To each test tube, crude enzyme preparation containing "depolymerase or deoxyribonuclease," was added.
(v) Only one test tube was heated to 65°C after adding the enzyme.
(vi) Relative viscosities of both the preparations were measured.
The given figure represents locations in human female reproductive system that are affected by different birth control measures. Identify the birth control measures and select the correct option.
Two bird populations (A and B) on two islands were examined for their beak sizes. The results are shown in graphs 1 and 2 respectively. When these two populations were brought together on one island, competition for the ecological niche between birds with identical beaks greatly increased and they were reduced in number. This situation is correctly depicted in:
Two different mutations were found in a gene. The gene has been cloned and an antibody is available for the protein product of this gene. Northern and Western analyses were performed on each mutant (1 and 2) and the wild-type gene (Wt,no mutation). The results are shown below. What type of mutation has occurred in the two mutants?
A)
Mutants 1 and 2 both have missense mutations at different positions
doneclear
B)
Mutant 1 has a missense mutation, while mutant 2 has a silent mutation
doneclear
C)
Mutant 1 has a missense mutation, while mutant 2 has a nonsense mutation
doneclear
D)
Mutant 1 has a nonsense mutation, while mutant 2 has a silent mutation
Succession in a forest ecosystem is characterized by changes in species diversity, biomass and net primary productivity as shown in the graph below. Identify curves a, b and c.
A)
a: biomass, b: net primary productivity, c: species diversity
doneclear
B)
a: species diversity, b: net primary productivity, c: biomass Herbs Shrubs Trees
doneclear
C)
a: net primary productivity, b: biomass, c: species diversity
doneclear
D)
a: net primary productivity, b: species diversity, c: biomass
Refer the given paragraph. A woman has a rare abnormality of the eyelids called ptosis which unables her to completely open her eyes. The condition has been found to depend on a single dominant gene (P). The woman's father had ptosis but her mother had normal eyelids. Her father's mother had normal eyelids. Which of the following could most likely be correct regarding the given paragraph?
A)
The woman has homozygous recessive genotype.
doneclear
B)
The woman's father has homozygous recessive genotype.
doneclear
C)
The woman's mother has homozygous recessive genotype.