Question
Write about chemical evolution in brief.
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A child suffering from thalassemia is born to a normal couple. But the mother is being blamed by the family for delivering a sick baby.
- What is thalassemia?
- How would you counsel the family not to blame the mother for delivering a child suffering from this disease? Explain.
- List the values your counselling can propagate in the families.
Study the illustration given and answer the questions that follow:
Draw a diagram of ‘b’ separately and label the parts:
Draw a diagram of ‘b’ separately and label the parts:
- That help its entry into ‘a’;
- That carry genetic material;
- That help in its movement.
- Explain with the help of Griffith's experiment, how the search for genetic material was conducted and what was the conclusion drawn.
- How did Mac Leod, Mc Carty and Avery establish the Biochemical nature of the socalled. "genetic material' identified by Griffith in his experiments?
- How is artificial hybridisation considered a crop improvement programme?
- Explain the process of artificial hybridisation, if
- Female parent bears bisexual flowers.
- Female parent bears unisexual flowers.
Differentiate between the genetic codes given below:
- Unambiguous and Universal.
- Degenerate and Initiator.
What is meant by microorganisms in industrial products? How do microorganisms help us in making beverages? Explain.
- Cancer is one of the most dreaded disease. Explain 'contact inhibition' and 'metastasis with respect to the disease.
- Name the group of genes that have been identified in normal cells that could lead to cancer. How do these genes cause cancer?
- Name any two techniques that are useful in detecting cancers of internal organs.
- Why are cancer patients often given a-interferon as part of the treatment?
Explain the post pollination events up to double fertilisation, that occur in an angiosperm.
Answer the following questions:
Four children with four different blood groups are born to parents where the mother has blood group ‘A’ and the father has blood group ‘B’. Work out the cross to show the genotypes of the parents and all four children.
Four children with four different blood groups are born to parents where the mother has blood group ‘A’ and the father has blood group ‘B’. Work out the cross to show the genotypes of the parents and all four children.
Answer the following questions:
Give a schematic representation of oogenesis in human female indicating the chromosomal number at each step. Mention at what stage of female life does each phase occur.
Give a schematic representation of oogenesis in human female indicating the chromosomal number at each step. Mention at what stage of female life does each phase occur.