TLS Online TPP Program

#Question id: 5223


In order to determine the probable function of a particular sequence of DNA in humans, what might be the most reasonable approach?

#Unit 11. Evolution and Behavior
  1. Prepare a knockout mouse without a copy of this sequence and examine the mouse phenotype.

  2. Genetically engineer a mouse with a copy of this sequence and examine its phenotype.

  3. Look for a reasonably identical sequence in another species, prepare a knockout of this sequence in that species and look for the consequences.

  4. Prepare a genetically engineered bacterial culture with the sequence inserted and assess which new protein is synthesized.

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TLS Online TPP Program

#Question id: 4744

#Unit 8. Inheritance Biology

Assume that long ear lobes in humans are an autosomal dominant trait that exhibits 50% penetrance. A person who is heterozygous for long ear lobes mates with a person who is homozygous for normal ear lobes. What is the probability that their first child will have long ear lobes.

TLS Online TPP Program

#Question id: 4745

#Unit 8. Inheritance Biology

In some goats, the presence of horns is produced by an autosomal gene that is dominant in males and recessive in females. A horned female is crossed with a hornless male. The F1 offspring are intercrossed to produce the F2. What proportion of the F2 offspring will have horns?

TLS Online TPP Program

#Question id: 4746

#Unit 8. Inheritance Biology

Two independent pure line varieties having deep red and brown phenotype in their seed coat were cross, the all f1 progeny is deep red. The F2 progeny obtain from selfing show deep red and brown in ratio of 15:1. Which of the following observation is correct?

TLS Online TPP Program

#Question id: 4747

#Unit 8. Inheritance Biology

How does incomplete dominance differ from incomplete penetrance?

TLS Online TPP Program

#Question id: 4748

#Unit 8. Inheritance Biology

Eye color in Drosophila present on X chromosome, Red eye color is dominant over white eye color. There is non disjunction in Meiosis I in female and normal meiosis in male. Female is white eye color was cross with red eye male. What will be expected phenotype in their progeny?

TLS Online TPP Program

#Question id: 4781

#Unit 8. Inheritance Biology

Two non allelic gene P and Q governed  Glume color in sorghum.

P= blakish purple          

Q = raddish purple (dependent over P gene )

If heterozygous Raddish purple were cross with homozygous brown color .What are phenotypic ratio of  progeny?