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More genetics
| Question | Answer |
|---|---|
| What key could you use to represent the ABO blood groups? | AA or AO=A blood type BB or BO=B blood type AB=AB blood type OO=O blood type. |
| Why is the ABO blood group an example of co-dominance? | Because a person can be type A (dom), type B (also dom), and type AB (co-dominant). |
| Why is the ABO blood group an example of multiple alleles? | Alleles are specific traits within a gene and multiple alleles refers to having three or more genes for a trait. In this case there are four for this trait therefore there are multiple alleles. |
| Which chromosomes determine gender? | X and Y chromosomes. |
| Are the same genes present on the X and Y chromosome? Which chromosome is bigger? | No because they code for different things. The x chromosome is bigger. |
| What chromosome is responsible for causing color blindness? | X chromosome |
| Why is colorblindness and hemophilia a sex linked disease? | Because it shows up on the X chromosome therefore making it more prevalent in males. |
| What is a key you could use to represent color-blindness? | i=colorbind; I=normal; therefore possible combinations include X^I X^i, X^I X^I, X^i X^i, X^I Y, X^i Y |
| What is a key you could use to represent hemophilia? | h=hemophilic; H=normal; therefore possible combinations include X^H X^h, X^H X^H, X^h X^h, X^H Y, X^h Y |
| Why can females be homozygous and heterozygous with respect to sex linked genes, but males cannot? | Females have two X chromosomes and X chromosomes act as the linked trait for what the disease is, whereas the Y chromosomes do not. Males only have one X chromosome and one Y chromosome therefore they only have one chromosome that carries the sex-linked |
| Why is a female carrier always homozygous and heterozygous for an X-linked trait? | Because she has two x's and both x's code for something therefore she can be both homozygous dominant or homozygous recessive as well as heterozygous for an x-linked trait. |
| What is an example of two linked genes? | Haemeoplilia and color-blindness. |
| How can you identify when offspring are recombinants in a dihybrid cross between linked genes? | The defining characteristics are unpredicted combinations of characteristics, long frequency of new combination of phenotype, |
| Polygenetic inheritance | Single trait controlled by two or more sets of alleles. Examples are skin and eye color. |
| How can you identify when offspring are recombinants in a dihybrid cross between linked genes? continued | Statistical significant difference from ratios expected from either dihybrid and unlinked (9:3:3:1)or linked with no linkage (3:1) |
Created by:
MadelineCarlman
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