TLS Online TPP Program

#Question id: 2873


With reference to aberrant methylation of bases which of the following statements, if any, is false?

#Unit 2. Cellular Organization
  1. S-adenosylmethionine donates methyl groups to a range of different molecules in cells and frequently inappropriately methylates bases in DNA.

  2. Guanine is occasionally methylated to give O-6-methylguanine which base pairs with adenine rather than with cytidine.

  3. In each nucleated cell, about 300-600 adenines are converted to 3-methyladenine per day.

  4.  3-methyladenine can be a cytotoxic base: it distorts the double helix and that can disrupt crucial DNA-protein interactions.

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TLS Online TPP Program

#Question id: 3563

#Unit 8. Inheritance Biology

Independent assortment is based on the random separation of homologous pairs of chromosomes in anaphase I of meiosis; it takes place when genes encoding two characters are located

TLS Online TPP Program

#Question id: 3564

#Unit 8. Inheritance Biology

Population locus with four alleles. How many genotypes are present in the population?

TLS Online TPP Program

#Question id: 3565

#Unit 8. Inheritance Biology

Mendel crossed yellow-seeded and green-seeded pea plants and then allowed the offspring to self-pollinate to produce an F2 generation. The results were as follows: 6,022 yellow and 2,001 green. Which of the following statements correctly describes the relationship of the allele for green seeds to the allele for yellow seeds?

TLS Online TPP Program

#Question id: 3566

#Unit 8. Inheritance Biology

Two organisms, with genotypes BbDD and BBDd, are mated. Assuming independent assortment of the B/b and D/d genes, determine the genotypic ratios in offspring that would occur.

TLS Online TPP Program

#Question id: 3567

#Unit 8. Inheritance Biology

Cross is made between a pure breeding plant having red coloured flowers with a pure breeding plant having white coloured flowers. All of these offspring are red colored flower. Upon selfing of these F1 red flower plant produced both red and white flower. Which of the following is not a conclusion of these cross?

TLS Online TPP Program

#Question id: 3568

#Unit 8. Inheritance Biology

You begin to study a novel plant species and discover that this diploid plant has 16 chromosomes. How many linkage groups would you expect to find?