Chapter 11 Chromosome “issues”
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Transcript of Chapter 11 Chromosome “issues”
![Page 1: Chapter 11 Chromosome “issues”](https://reader036.fdocuments.in/reader036/viewer/2022082422/56812d0d550346895d91e3c4/html5/thumbnails/1.jpg)
CHAPTER 11CHROMOSOME “ISSUES”
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Genetic Disorders:
Recessive (t)- Caused by
receiving 2 “bad” recessive alleles
- Ex. T= normal t = albino
tt = albino disorder
Dominant (T)- Caused by
receiving at least 1 “bad” dominant allele
- Ex. T = dwarf t = normal
Tt = dwarf disorder
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Pedigree
Is a diagram that Traces the
inheritanceOf a particular trait Through several Generations.
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Sex-linked Traits pg 307
Occur on the X chromosome at number 23.
More frequent in males
Ex. Colorblindness
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11.2 Complex Patterns of inheritance
Incomplete Dominance
= the heterozygous genotype creates a new phenotype!
Codominance
= both alleles are dominant and therefore a combined phenotype is shown
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Incomplete dominance pg. 302 R = red flowers r = white flowers
RR – red rr - white
Rr = pink
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Codominance pg. 302
Both alleles show dominance!
Ex – blood types Type AB shows the
A allele as well as the B allele!
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Polygenic Traits pg. 309
Traits such as height, skin color, that are determined by several Genes, not just two alleles!
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karyotype
Picture of all of your 46 chromosomes - paired!
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Law of segregation pg. 279
= “states that two alleles for each trait separate during meiosis.
Upon fertilization (zygote) they will reunite!
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Law of Independent Assortmentpage 280 “states that alleles
randomly distribute themselves during meiosis.
Genes on separate chromosomes will switch.
This allows for more variation!