If meiosis did not occur in sexually reproducing organisms
1.growth of the zygote would be halted.
2.mitosis would be sufficient.
3.gametes would be haploid.
4.the chromosome number would double in each generation.
5.eggs would be haploid, but sperm would be diploid.
4
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A pure-breeding fruit fly with curled wings mates with a pure-breeding fruit fly with normal (straight) wings. The F1 mate with each other to produce an F2 generation that consists of 160 flies with curled wings and 80 with straight wings. What can you infer from this observation?
A) Curled wings is a recessive trait. B) The dominant curled wing allele is also a recessive lethal. C) Wing shape is controlled by two codominant alleles. D) Two interacting genes determine wing shape. E) All of the hybrid F1 flies had straight wings.
Animals most likely evolved from a colony similar to __________, a type of protist. Fill in the blank(s) with the appropriate word(s)
What are the three main elements on which plant growth and development depend?
a) sulfur; nitrogen; phosphorus b) oxygen; carbon; hydrogen c) phosphorus; nitrogen; oxygen d) potassium; carbon; oxygen e) nitrogen; carbon; oxygen
Which of the following kinds of extinction has been linked to collisions of bolides with earth?
A) background extinction B) mass extinction C) anthropogenic extinction