With the help of a checkerboard show the types of offspring that might be produced in a cross between a hybrid black guineapig and a pure white guineapig. State the law of segregation as proposed by Mendel. [3+2=5]
When a hybrid black guinea pig (Bb) is crossed with a pure white guinea pig (bb), the potential offspring can have two genotypes: Bb (black) and bb (white).
Using a Punnett square, we can represent the possible combinations:
B | b | |
b | Bb | bb |
b | Bb | bb |
From the Punnett square, we can see that there is a 50% chance of producing offspring with the Bb genotype (black) and a 50% chance of producing offspring with the bb genotype (white).
State the law of segregation as proposed by Mendel: The law of segregation states that actors passed from one generation to another in an unaltered manner; they separate during gamete formation, reunite during fertilization and pass to the next generation.
Question ID: 477
Uploaded on: October 7, 2024
Mention the symptoms of thalassemia disease. In many families, mothers are labelled as responsible for the birth of a daughter's child. Demonstrate with the help of a cross, that these beliefs are not justified.
Symptoms of thalassemia:
Regarding the belief that mothers are responsible for the birth of a daughter's child, let's consider a simple cross to demonstrate why this belief is not justified:
From this cross, we can observe that the father's contribution of the Y chromosome determines the birth of a male child. Therefore, it is incorrect to solely blame or attribute the birth of a daughter's child to the mother.
Question ID: 478
Uploaded on: October 8, 2024
Mentions two features of internal structures on the basis of which, the ‘flipper of whales’ and ‘wings of birds’ are considered as homologous organs. How a worker bee of a beehive communicates with other worker bees regarding the source and location of food? OR Show the major evolutionary events with the help of a flow chart.
The flipper of whales and the wings of birds are considered homologous organs due to their shared internal structures. Both have similar skeletal structures, including the humerus, ulna, radius, and carpals. Additionally, their muscle structures for controlling movement are also alike. These similarities suggest a common ancestry, despite their different functions in swimming and flying, respectively.
In a beehive, a worker bee communicates food source information to others through two main dances. The waggle dance conveys the direction and distance of the food source. The angle of the dance represents the direction relative to gravity, while the duration of the waggle indicates the distance. For food sources within 75 meters, the round dance is performed, signalling the availability of food without specifying the direction. Other worker bees interpret these dances and follow the communicated information to locate the food source.
OR
Protovirus → Virus → Bacteria → Protozoa → Multicellular organism → Chlorophyllous organism → Plants
Question ID: 479
Uploaded on: October 8, 2024
What are the causes of Asthma? What are the roles of Joint Forest Management in the conservation of biodiversity?
Question ID: 480
Uploaded on: October 8, 2024
Assess the causes of depletion of the biodiversity with proper examples.
Question ID: 481
Uploaded on: October 8, 2024
Propose two conservation measures that could be taken to increase the number of Indian one-horned rhinos. Make your opinion based on your experience of how the source of freshwater becomes polluted. [2+3=5]
Part I.
Part II.
Question ID: 482
Uploaded on: October 8, 2024
Which conditions do you consider to declare one area out of two as a biodiversity hotspot? Give two examples of ex-situ conservation.
The two conditions that need to be met for an area to be considered a biodiversity hotspot:
Here are two examples of ex-situ conservation:
Question ID: 483
Uploaded on: October 8, 2024
Mention one feature of unstriated muscle. [For External Candidates]
One feature of unstriated muscle is that it is not attached to bones.
Question ID: 484
Uploaded on: October 8, 2024
Which cell organelle is referred to as the “kitchen of the cell”? [For External Candidates]
The mitochondria are referred to as the “kitchen of the cell”.
Question ID: 485
Uploaded on: October 8, 2024
In which type of cell, the nucleus is not well organized? [For External Candidates]
Anucleate cells do not have a nucleus. This type of cell is found in bacteria and some other single-celled organisms.
Question ID: 486
Uploaded on: October 8, 2024
Give an example of a flower pollinated by air. [For External Candidates]
Paddy.
Question ID: 487
Uploaded on: October 8, 2024
Write one important feature of life. [For External Candidates]
One important feature of life is the ability to reproduce.
Question ID: 488
Uploaded on: October 8, 2024