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TLS Online TPP Program

#Question id: 9239

Why are changes in the global carbon cycle important?

#Unit 9. Diversity of Life Forms
  1. Burning increases available carbon for primary producers and, therefore, primary consumers.
  2. Deforestation and suburbanization increase an area's net primary productivity.
  3. Increasing atmospheric concentrations of carbon dioxide are altering Earth's climate.
  4. By using fossil fuels, we are replenishing a nonrenewable resource.
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TLS Online TPP Program

#Question id: 12696

#Unit 8. Inheritance Biology

The following is a schematic representation of region of the chromosome of fly along with extent of six deletions (Del 1 to Del 6); 
When flies homozygous for the recessive mutations are crossed with flies heterozygous for the deletions, the following results are obtained, in which "m" represents a mutant phenotype and a plus sign (+) represents the wild type. On the basis of these data, determine the relative order of the seven mutant eenes on the chromosome. 
TLS Online TPP Program

#Question id: 12695

#Unit 8. Inheritance Biology

A panel of cell lines was created by human—mouse somatic-cell hybridization. Each cell line was examined for the presence of human chromosomes and for the production of three enzymes. The following results were obtained: 

On the basis of these results, give the chromosomal locations of the genes encoding enzyme 1, enzyme 2, and enzyme 3. 
TLS Online TPP Program

#Question id: 12694

#Unit 8. Inheritance Biology

A panel of cell lines was created by human—mouse somatic-cell hybridization. Each line was examined for the presence of human chromosomes and for the production of an enzyme. The following results were obtained: 

On the basis of these results, which chromosome has the gene that encodes the enzyme? 
TLS Online TPP Program

#Question id: 12693

#Unit 8. Inheritance Biology

A panel of cell lines was created by human-mouse cell line hybridization. Each line was examined for the presence of  human chromosome and for the gene production. The following result were obtained;
On the basis of these results, which chromosome has the gene  that encodes the enzyme ?
TLS Online TPP Program

#Question id: 4899

#Unit 8. Inheritance Biology

In Neurospora a cross between the genotypes 'A' and 'a' results in an ascus with ascospores of genotypes as shown below: 

Ascus Class

Ascospore

I

A

A

A

A

a

a

a

a

II

A

A

a

a

a

a

A

A
                   

 Statements A to D are events that could have occurred during meiosis.

A) Class I is results of no crossing over between the centromere and gene.

B) Class II is results of single crossing over between the centromere and gene

C) Class I shows segregation of alleles 'A' and 'a' in meiosis II

D) Class II shows segregation of alleles 'A' and 'a' in meiosis II
TLS Online TPP Program

#Question id: 4898

#Unit 8. Inheritance Biology

A three point test cross was carried out in Drosophila melanogaster involving three adjacent genes A, B and C. arranged in the same order. The distance between A to B is 15 map unit (mu) and that between B to C is 30 map. The coefficient of coincidence = 0.67. What is the percentage of double recombinants in the progeny obtained from the testcross?