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Question
Errors in meiosis can be one mechanism of evolution. A change in the number of chromosomes can lead to the production of new species. Some plant species may have originated from errors during cell division, which led to them having more than two sets of chromosomes, a condition called polyploidy. Hypothesize what kind of error during meiosis might occur to cause a normally diploid plant to generate tetraploid offspring, in which the offspring have four sets of chromosomes.
Answer
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On average, about how often does ovulation occur?
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Through what structure does an oocyte travel on its way to the uterus?
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If you could stop diffusion of substances in fruit fly zygotes, could you stop normal development? Why or why not?
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Programmed cell death is also known as ________.
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You are a substitute teacher in a high school biology lab class on the day the students are dissecting frogs. A particularly bright student happens to notice that the left adrenal gland is malformed in her frog. She asks if a problem in embryonic development could have caused that. Although there may be more than one reason, what might you propose as an explanation based on embryonic development?
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The end of a zygote that contains less yolk is the animal pole.
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Which of the following is a process by which an initial set of genes turns on a second set of regulatory genes, which eventually turns on a third set of genes?
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Of the choices listed, the first event that occurs during embryonic development is:
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The phase during which embryonic cells arrange themselves into three layers is called:
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C) organogenesis.
D) fertilization.
E) induction.