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19 Cards in this Set
- Front
- Back
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why isn't every gene in the cell being expressed at one time?
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once a cell gets its "job" it doesnt need the other genes so those are dormant or shut off.
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when does cell differentiation occur?
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when the cell gets its "job"
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how does cell differentiation link to gene regulation?
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when a cell is differentiated, it only expresses genes from part of that cell, and in gene regulation, not all genes is working simultaneously, instead some are active and some dormant.
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what are stem cells and why are they important?
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stem cells are undifferentiated cells and they are important for becoming other functioning cells, injury repair, and responding to environment to create types and amounts of proteins.
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what is the controversy behind stem cell research?
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controversy= people think when an egg is fertilized, that means there is life.
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what is the importance of homeotic genes?
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they determine which body parts are made at what location.
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what process would most likely occur after DNA replication?
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cell reproduction/mitosis/meiosis
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how many chromosomes would a human diploid cell have?
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46
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how many chromosomes would a human haploid cell have?
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23
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how many autosome chromosomes does a human have?
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22
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how many gamete chromosomes does a human have?
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1
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after fertilization, how many chromosomes would be present in a human?
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46
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the majority of our cells are (diploid or haploid)?
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diploid
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gametes are...(diploid or haploid)
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haploid
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how many chromosomes would you find in a human sperm cell?
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23
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when a human is born with an extra chromosome, why has this happened?.... through what process?
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this has happened because the sister chromatids of one chromosome didn't separate in one step of meiosis, they get an extra at the end. it is called non disjunction.
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what is trisomy 21?
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down syndrome.
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state mendels law of segregation?
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states the sex cell of a plant or animal may contain one factor (allele) for different traits but not both factors needed to express the traits
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state mendels law of independant assortment?
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states that characteristics are inherited independently from other characteristics.
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