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TLS Online TPP Program

#Question id: 12496

A woman who has two brothers and a maternal uncle (her mother's brother) with non-specific X-linked mental retardation is referred for genetic counselling. There are no diagnostic tests available to help determine whether or not she is a carrier. Which of the following is correct?

#Unit 8. Inheritance Biology
  1. The prior probability that she is a carrier is 1 in 4.
  2. The woman already has two unaffected sons. Therefore, the probability that she is a carrier can be calculated using Bayes' theorem to be 1 in 5.
  3. This means that the probability that her next son will be affected or that her next daughter will be a carrier is 1 in 5.
  4. The probability that the maternal grandmother of this woman is a carrier is 1 in 2.
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TLS Online TPP Program

#Question id: 18728

#Unit 13. Methods in Biology

Which of the following statements is true in case of homopolymer tailing for producing sticky ends?
TLS Online TPP Program

#Question id: 29049

#Unit 10. Ecological Principles

Some given statements about anti freezing are given;
a. some invertebrates to withstand temperatures as low as –18°C without freezing, in presence of glycoproteins
b. Sodium, potassium, or chloride ions involve to increasing  the blood freezing point, so the lack of these ions some species help to lower the blood freezing point
c. Amphibians release large amount of glucose into the blood to prevent freezing of blood in cold
d. Sodium, potassium or urea function as anti freezing in their blood
e. Glycine causes supercooling in plants
Which of the following statements about supercooling/anti freezing is correct?
TLS Online TPP Program

#Question id: 7312

#Unit 5. Developmental Biology

Following statements regarding to the classes of genes that regulate floral development:

A.  Floral organ identity genes directly control floral identity. The proteins encoded by these genes are transcription factors that likely control the expression of other genes whose products are involved in the formation and/or function of floral organs.

B.  Cadastral genes act as spatial regulators of the floral organ identity genes by setting boundaries for their expression.

C.   Meristem identity genes are necessary for the initial induction of the organ identity genes. These genes are the positive regulators of floral organ identity.

D.  Cadastral genes act as negative regulators of the floral organ identity genes by inhibits their expression.

E.   Meristem identity genes are the negative regulators of floral organ identity genes.

Which of the above statements are true?
TLS Online TPP Program

#Question id: 18999

#Unit 13. Methods in Biology

In which type of chromatography, the stationary phase held in a narrow tube and the mobile phase is forced through it under pressure?
TLS Online TPP Program

#Question id: 9211

#Unit 9. Diversity of Life Forms

Of the following ecosystem types, which have been impacted the most by humans?