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Unit 07-Complex Genetics

What are the sex chromosomes for a normal male? XY
In a pedigree how would we show a male that has the trait we are observing? Filled-in square
What is the general term for when you have more than 2 copies of a chromosome? Trisomy
What is a single term to explain incomplete dominance? Blending
What is an example of a multiple allele trait? ABO blood typing
In pedigrees, traits can be sex-linked or ___________. Autosomal
For females to express a recessive sex-linked trait, how many alleles for that trait do they have to receive in order to display that trait? 2 copies
When dealing with a trait that is codominant, explain what a heterozygous individual will display. They will have ½ of one version and ½ the other version.
What is a genotype for heterozygous Type B blood? Bi
Can a female ever get a sex-linked recessive disorder? If no, explain why. If yes, give example of genotype. yes, XhXh
What are two methods of pre-natal testing that can be done to determine if there are chromosomal number problems? Amniocentesis and CVS (chorionic villi sampling)
What is an example of a trisomy for chromosome #21? Down syndrome
Autosomal means the chromosome pairs numbered 1-? 1-22
What little letters do we never use with blood typing? a, b
What is the term for when there are several genes that will influence a trait (example: skin color in humans) Polygenic trait
Why can’t males be a carrier for a recessive X-linked disorder? Because males only get one X chromosome, so they have it or do not.
Sex-link traits are mostly on which of the sex chromosomes? X chromosome
What are the sex chromosomes for a normal female? XX
What is the term for when chromatids fail to separate properly? Nondisjunction
What is the term for the picture of an individual’s chromosomes? Karyotype
In a dihybrid cross: B=black/b=brown, T=trotter/t=pacer If parent 1 is hetero black and a pacer: If parent 2 is brown and a hetero trotter: Give the 2 parent genotypes: parent 1:Bbtt parent 2:bbTt
Same cross: In a dihybrid cross: B=black/b=brown, T=trotter/t=pacer If parent 1 is hetero black and a pacer: If parent 2 is brown and a hetero trotter: Determine the parent genotypes. Then determine the gametes for both? Then determine the phenotypes? parent 1:Bbtt parent 2:bbTt gamete: Bt, Bt, bt, bt gamete: bT, bt, bT, bt phenotypes: 4 for each type
Created by: thompsondk



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