How do meiosis and union of gametes produce genetically variable offspring?
What will be an ideal response?
The random shuffling of homologous maternal and paternal chromosomes during meiosis I creates new chromosome combinations. Crossing over also creates new allele combinations on chromosomes. Consequently, a parent probably never produces any gametes that are completely identical. The fusion of two genetically unique gametes adds further genetic variability to the offspring.
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Expression of a cloned eukaryotic gene in a bacterial cell involves many challenges. The use of mRNA and reverse transcriptase is part of a strategy to solve the problem of _____
A) post-transcriptional processing B) electroporation C) post-translational processing D) nucleic acid hybridization E) restriction fragment ligation
Using polyethylene glycol (PEG), early G1 phase cells were fused with S phase cells. Of the following events, which would you expect to be induced in the G1 cells as a result of the fusion?
A) cytokinesis B) condensation of chromosomes C) DNA replication D) mitosis E) spindle fiber formation
How are parasitoids different than parasites?
a. they are usually not insects b. they affect only plants c. the host is killed d. they have no lasting effect on their hosts e. they usually only affect the eggs of birds
The tertiary stage of syphilis
A) Is when gummas develop in tissues. B) Occurs within 10 days of the primary stage. C) Is when a chancre develops. D) Is when the patient is highly infectious to others. E) Has no symptoms