Term
| What is the system of sex determination in humans? |
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Definition
| The X-Y system where XX is female and XY is male |
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Term
| How is gender determined in the system of sex determination in humans? |
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Definition
| The sperm contains half Y's and half X's |
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Term
| What is the system of sex determination in some insects? |
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Definition
| X-O system, where XX is female and XO (one chromosome) is male. |
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Term
| What determines the system of sex determination in insects? |
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Definition
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Term
| What is the system of sex determination in birds, some fishes and some insects? |
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Definition
| Z-W system, where ZW is female and ZZ is male. |
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Term
| What determines the sex determination in some fish, butterflies, birds? |
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Definition
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Term
| Which species have the most chromosomes? |
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Definition
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Term
| Are there sex chromosomes in most species of ants and bees? |
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Definition
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Term
| How do females form in ants and bees? |
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Definition
| From fertilized eggs as diploids. |
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Term
| How do males form in ants and bees? |
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Definition
| From unfertilized eggs as haploid from sperm going through mitosis. |
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Term
| X chromosome inactivation |
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Definition
| One female chromosome remains inactive in each cell. |
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Term
| Since females have two X chromosomes, do they code for twice the number of proteins from those X-linked genes? |
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Definition
| No. X chromosome inactivation prevents that. |
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Term
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Definition
| The condensed inactive X chromosome in females. |
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Term
| How is the Barr body determined in each cell? |
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Definition
| Inactivation occurs independently of one another. when the embryo is at ~200 cells. |
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Term
| Does the Barr Body change during mitotic division? |
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Definition
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Term
| What is an example of a phenotype affected by X inactivation? |
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Definition
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Term
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Definition
| Genes inherited together in genetic crosses because of their close proximity to one another. |
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Term
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Definition
| Gene exchange between homologous chromosomes during Prophase 1 of meiosis. |
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Term
| What influences Crossing Over? |
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Definition
| The distance between genes and the distance from the centromere. In both cases, the farther away, the more often crossing over occurs. |
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Term
| Genetic disorders may be... |
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Definition
| Dominant, recessive, autosomal and sex linked. |
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Term
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Definition
| Genes located on X-chromosomes in humans. |
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Term
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Definition
| Having only one allele for a gene, which males have. |
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Term
| Are males homozygous or heterozygous for genes on the X chromosome? |
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Definition
| Neither -- they are hemizygous. |
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Term
| Which gender can be heterozygous for sex-linked genes? |
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Definition
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Term
| What is an autosomal recessive trait? |
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Definition
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Term
| What results from Sickle-cell anemia? |
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Definition
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Term
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Definition
| A family tree presentation of a genotype and phenotype. |
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Term
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Definition
| An individual that is heterozygous for a recessive condition. |
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Term
| Does a carrier express the condition? |
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Definition
| No, but they can pass it om. |
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Term
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Definition
| Individual homologous chromosomes displayed in order from longest length to shortest length. |
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Term
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Definition
| Having 1+ additional sets of chromosomes. |
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Term
| What happens as a result of Polyploidy? |
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Definition
| Fatal in humans, but plants seem fine. |
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Term
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Definition
| More of fewer chromosomes than the normal amount present. |
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Term
| What may happen due to Aneuploidy? |
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Definition
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Term
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Definition
| When homologous chromosomes in Anaphase 1 or sister chromatids in Anaphase 2 fail to separate. |
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Term
| How does non-disjunction occur? |
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Definition
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