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TLS Online TPP Program

#Question id: 5215

What is it about short tandem repeat DNA that makes it useful for DNA fingerprinting?

#Unit 11. Evolution and Behavior

  1. The number of repeats varies widely from person to person or animal to animal.

  2. The sequence of DNA that is repeated varies significantly from individual to individual.

  3. The sequence variation is acted upon differently by natural selection in different environments.

  4. Every racial and ethnic group has inherited different short tandem repeats.

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TLS Online TPP Program

#Question id: 11122

#Unit 9. Diversity of Life Forms

Phylogenetic hypotheses (such as those represented by phylogenetic trees) are strongest when
TLS Online TPP Program

#Question id: 24029

#General Aptitude

The total number of members in the Press Council of India are:
TLS Online TPP Program

#Question id: 4704

#Unit 11. Evolution and Behavior

About thirteen different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago. Genetically, there are four distinct lineages, but the thirteen species are currently classified among three genera. The first lineage to diverge from the ancestral lineage was the warbler finch (genus Certhidea). Next to diverge was the vegetarian finch (genus Camarhynchus), followed by five tree finch species (also in genus Camarhynchus) and six ground finch species (genus Geospiza). If the six ground finch species have evolved most recently, then which of these is the most logical prediction?
TLS Online TPP Program

#Question id: 16962

#Unit 11. Evolution and Behavior

Which statements is not true for Mega evolution?
TLS Online TPP Program

#Question id: 15151

#Unit 8. Inheritance Biology

In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.
Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses is made between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in series with a recessive mutation in one gene and a dominant mutation in the other, determine the phenotype of the F1 progeny and the expected phenotypic ratio of red to white eyed insects in the F2.