a- A scientist was examining the offspring of an organism, suggest how to determine the type of reproduction by which these offspring were produced.
identical > asexual Non-identical >sexual
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a- If you were observing different cells during their cell cycle suggest how to differentiate between the interphase and the prophase.
chromatin =interphase, condensed chromosomes =prophase 2) nucleus present =interphase, nucleus disappears =prophase 3) spindle fiber not present =interphase, s
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b- By observing the human karyotype, suggest how to determine the gender (Male or female).
look at sex chromosomes xx =female Xy=male
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A biologist was examining the somatic cells of a newly discovered species of insects, he found 68 chromosomes in these cells, how many chromosomes will be found in the egg cells of this newly discovered species.
34 chromosomes ………………………………..
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How Many pairs of autosomes are there in this karyotype?
22 pairs of chromosomes
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a. Solve: Some students were observing a diagram demonstrating the 2 types of cell division. How many cells are produced by the meiotic cell division (meiosis)?
……………4 cells
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If you were given the number of the following nitrogenous bases in a DNA molecule (Adenine, thymine and Guanine), suggest how to find the number of cytosine bases in the same molecule.
same as guanine
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The rate of cell division varies greatly in different types of human cells, the data table below shows the replacement rates of many types of human cells.a- Which cell type has the shortest cell cycle?
lining of small intestine
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The rate of cell division varies greatly in different types of human cells, the data table b- If you were asked to add one more cell that divides by meiosis to this data table. below shows the replacement rates of many types of human cells.
reproductive cell (ovary/testes)/sperm and egg
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Question 12 Apply: Level 1-2 Why does the menstruation occur after the infertile phase?
to remove the broken endometrium and unfertilized eggs out of the body
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Question 13 Apply: Level 3-4 By observing the 3 phases of the menstrual cycle, in which phases will it be impossible for this woman to get pregnant.
infertile and menstruation
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Question 14 Interpret: Level 5-6 Is it possible for a woman to experience a delay
……………yes –if she is pregnant, Stress, low level of estrogen
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Question 15 Analyze: Level 7-8 A pharmacist discovered a medicine for a certain bacteria that reproduces asexually, he tested this medicine and found it to be
…yes , since bacteria reproduce by asexual reproduction so all generations will be identical , same medicine will work for all bacteria