21-In which stage of mitosis does exchange of genetic material between chromosomes (crossing over) occur?
a. prophase II
b. prophase I
c. none of the above
d. anaphase I
22-How does a population differ from an ecosystem?
a. An ecosystem includes a community, whereas a population does not.
A population consists of all living organisms in the area, whereas an ecosystem consists of all living and nonliving aspects of an area.
An ecosystem and a population are identical; they are two terms for the same concept.
A population consists of all living organisms in an area, whereas an ecosystem consists of only one species.
23-What is decreased during the process of meiosis?
All of the above are true.
the number of cells
c. the number of chromosomes
the size of chromosomes
24-A tendon or ligament is made up principally of loose connective tissue.
25-Albinism is an example of ________.
a. a polygenic disease
a dominant disease
c. an autosomal recessive disease
d. a sex-linked disease
26-In which phase do the following events occur: the chromatin condenses into chromosomes, the nuclear membrane disintegrates, and the centrioles migrate to the poles as spindle fibers are organized?
27-Specific segments of DNA that are the functional units of inheritance are called ________.
28-Glands that lack ducts and secrete hormones are called exocrine
29-Cancer is associated with problems related to the regulation of ________.
d. meiosis II
21)- option bis correct because crossing over occur in prophase-1 where recombinant chromosome is formed.
22)- option b is correct because population is group of organisms but in ecosystem we add non living things in environment.
23)- option c is correct because in this process chromosome number is half after division.
24)- option b is correct because it is made up of dense connective tissue.
25)-option c is correct because it is caused by recessive gene.
26)-option b is correct because division start in prophase.
27)-option d is correct because these are passed from parents to offspring.
28)- false . because they release chemical substance through duct.
29)- option b is correct because it is related to cytokinesis.
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