What is the nature of chromosomes that align themselves on the metaphase plate in metaphase I?

a. pair of sister chromatids facing opposite poles

b. pair of nonsister chromatids facing opposite poles

c. pair of tetrads facing opposite poles

A baby is born with what the primary care provider believes is a diagnosis of trisomy 21. this means that the infant has three number 21 chromosomes. what factor describes this genetic change?

How are niche, community and ecosystem related?

Determine whether the statements below about genes are true or false. 1. Genes are segments of DNA that are the basic unit of heredity. T or F 2. The genes of all organisms within a species are the same. T or F 3.

Which function is specific to the neuron? a. It generates electrochemical signals so that the body can react to stimuli. b. It produces antibodies to destroy pathogens for protection purposes. c.

What is a disadvantage of boiling water?

1. An example of an organism that has an incomplete digestive system is a. a sea star. b. a sponge. c. a spider. d. a sand dollar.

Does eubacteria live in extreme or normal environment

A freshwater plant is placed in salt water. Which of the following events would most likely occur? Group of answer choices an increase in the action of its contractile vacuole shriveling of the cell swelling of the cell until it bursts swelling of

During what geological period do the angiosperms become more common?. A. Triassic. B. Permian. C. Jurassic. D. Cretaceous

Residential construction is expanding in Florida, the expansion has caused fragmentation of habitats, one of the results of the increased construction is a decrease in the number of large predators such as the coyote, black bear and pool panther,