During normal meiosis, homologous chromosomes pair up and separate so that each gamete receives a copy of every chromosome. sometimes an error is made during this separation and homologous chromosomes fail to separate. this results in one gamete that has two copies of the chromosome, and another gamete that does not have the chromosome at all. this type of error is known as and usually results in zygotes that either do not develop to term or have severe abnormalities. a. chromosome inversion b. chromosome insertion c. chromosome translocation d. chromosome nondisjunction

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

If a checkpoint detects damaged dna, the checkpoint may

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources