Question

multiple choice 10 points
in a dikaryotic cell, (n + n) when the two nuclei (which originally came from two separate lineages) are fused to form a diploid (2n) cell, this fusion process is called...
fertilization
karyogamy
spermatogenesis
oogenesis
8 multiple choice 10 points
a nematode has a...
true coelom (eucoelomate)
pseudocoelom (pseudocoelomate)
no coelom of any sort (acoelomate)

Explanation:

Question 7

• Fertilization is fusion of gametes (not nuclei in a dikaryotic cell).
• Karyogamy is the fusion of two nuclei (as in dikaryotic to diploid).
• Spermatogenesis is sperm production.
• Oogenesis is egg production. So the correct process is karyogamy.

Nematodes (roundworms) are pseudocoelomates, meaning they have a pseudocoelom (a body cavity not completely lined by mesoderm). Eucoelomates have a true coelom lined by mesoderm, and acoelomates have no coelom.

Answer:

B. Karyogamy

Question 8