Question

58. In cases where members of two species produce an offspring but the offspring is sterile, the type of reproductive barrier is known as which of the following?

a) behavioral isolation             

b) temporal isolation               

c) reduced hybrid fertility

d) reduced hybrid viability      

e) hybrid breakdown

59. In cases where members of two species hybridize but the offspring are weak and unable to compete with non-hybrids, the type of reproductive barrier is known as which of the following?

a) behavioral isolation             

b) temporal isolation               

c) reduced hybrid fertility

d) reduced hybrid viability      

e) hybrid breakdown

60. Female birds typically observe the color pattern and behavior of male birds prior to approaching them to determine their species (prior to assessing them as a potential as a mate). This initial inspection prevents them from hybridizing and is referred to as which of the following?

a) behavioral isolation             

b) temporal isolation               

c) reduced hybrid fertility

d) reduced hybrid viability      

e) hybrid breakdown

Answer 1

58. In cases where members of two species produce an offspring but the offspring is sterile, the type of reproductive barrier is known as which of the following?

c) reduced hybrid fertility.

Usually the hybrid is healthy but sterile. Mule is an example ,the hybrid of donkey and mare is sterile because of chromosome number due to an error occured in meiosis.

59. In cases where members of two species hybridize but the offspring are weak and unable to compete with non-hybrids, the type of reproductive barrier is known as which of the following?

d) reduced hybrid viability.

It defiens incompatible genetics because of mating between different species that lowers the potential to survive for organisms.

60. Female birds typically observe the color pattern and behavior of male birds prior to approaching them to determine their species (prior to assessing them as a potential as a mate). This initial inspection prevents them from hybridizing and is referred to as which of the following?

a) behavioral isolation    

Behavioural isolation ethological isolation, is based on the  the behavior of species with respect to mating rituals and signals.