Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 8768
TLS Online TPP Program

#Question id: 11986

Which of the following statements is (are) true of fixed action patterns? 

#Unit 10. Ecological Principles
  1. They are highly stereotyped, instinctive behaviours.
  2. They are triggered by sign stimuli in the environment and, once begun, are continued to completion. 
  3. An inappropriate stimulus can sometimes trigger them.
  4. A, B, and C
More Questions
TLS Online TPP Program

#Question id: 29095

#Unit 8. Inheritance Biology

The following table summarizes the result of a cross between two strains of Neurospora having the alleles A and a, respectively. The table shows the different patterns of octad arrangement, and the number of ascus observed of each type;

A) According to the graph first two column are from meiosis with no crossover between locus A and_____I_______ 

B) The pattern for first these two columns represent______II_______

C) The distance between the locus A and the centromere is ___III___ map units
TLS Online TPP Program

#Question id: 29096

#Unit 8. Inheritance Biology

When a homozygous plant that produces purple fruit (PP) is crossed with a homozygous plant that produces white fruit (pp), all the heterozygous F1 (Pp) produce violet fruit If an F1 eggplant is used in a testcross, what proportion of the progeny from this cross will be white?
TLS Online TPP Program

#Question id: 29097

#Unit 8. Inheritance Biology

In the Palomino horses color is determined by three alleles at a single locus; C+/C+(light chestnut), C+/Ccr (Palomino), Ccr/Ccr (cremello). Chestnut is dominant over Palomino and cremello, and Palomino is dominant over cremello (C+/C+> C+/Ccr> Ccr/Ccr). What will be expected phenotypes and ratios of offspring produced by the C+C+/CcrCcr X C+Ccr/CcrCcr crosses?
TLS Online TPP Program

#Question id: 29098

#Unit 8. Inheritance Biology

A family in which club foot was inherited as an autosomal dominant trait. They discovered a mutation in the PITXI gene that caused club foot in this family. Through DNA testing, they determined that 11 people in the family carried the PITXI mutation, but only 8 of these people had club foot. Which of the following is the correct interpretation of the observation?
TLS Online TPP Program

#Question id: 29099

#Unit 8. Inheritance Biology

The type of plumage found in mallard ducks is determined by three alleles at a single locus: MR, which encodes restricted plumage; M, which encodes mallard plumage; and md, which encodes dusky plumage. The restricted phenotype is dominant over mallard and dusky; mallard is dominant over dusky (MR > M > md). The expected phenotypes and proportions of offspring is 3/4 restricted, 1/4 mallard by which of the following crosses?
TLS Online TPP Program

#Question id: 29100

#Unit 8. Inheritance Biology

The adult flies that emerged had a eyeless mutation phenotype in Drosophila produces greatly reduced eyes.. When this eyeless fly was crossed to a known reduced eye  mutant fly, all the progeny had normal phenotype. The observed phenotype can be best explained as an example of__