Write the genotypes for each individual on the pedigree. (Answers should be all dominant TT except for the I-1 or I-2 Tt, Tt, II-3 should be Tt as well as II-6 Tt, III-4 and III-5 should be Tt IV, these will show as IV-2 tt IV-4 as tt also. Determining Inheritance Patterns
Pedigree Worksheet KEY Genetics Pedigree Worksheet pedigree is a chart of a person’s ancestors that is used to analyze genetic inheritance of certain traits – especially diseases. The symbols used for a pedigree are: female, unaffected male, unaffected female, affected male, affected
When working through a pedigree, the first thing you need to do is figure out which characteristic is dominant – the shaded one or the un-shaded one. Then you need to choose a letter (let’s use A) and begin assigning genotypes. Remember that recessive individuals are
And a square represents a male in the family. If either the circle or the square is colored in, like we see right over here, or we see right over here, that means that that person exhibits the trait. And the trait of this particular pedigree is for is the trait of freckles.
Any shaded individual would have the genotype ff. All of the non-shaded individuals must have at least one dominant allele, F, because they are not affected with this recessive disorder.
0:3113:48Genotypes and pedigrees - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou need to figure out which one of those three it is okay now based on this one this is the exactMoreYou need to figure out which one of those three it is okay now based on this one this is the exact same pedigree from the warm up or almost the exact same.
A completely shaded circle or square indicates that a person expresses the trait. A circle or square that is not shaded indicates that a person neither expresses the trait nor is a carrier of the trait. A black X represents death of the individual.
Key termsTermMeaningPedigreeChart that shows the presence or absence of a trait within a family across generationsGenotypeThe genetic makeup of an organism (ex: TT)PhenotypeThe physical characteristics of an organism (ex: tall)Dominant alleleAllele that is phenotypically expressed over another allele5 more rows
Genotype examples A gene encodes eye color. In this example, the allele is either brown, or blue, with one inherited from the mother, and the other inherited from the father. The brown allele is dominant (B), and the blue allele is recessive (b).
2:037:18Test Cross (to Determine Genotype) - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd then you can use punnett squares to look at the possible outcomes for offspring from theseMoreAnd then you can use punnett squares to look at the possible outcomes for offspring from these crosses. Now the homozygous recessive individual here we're using the classic.
What is the genotype of individual 6? only, white only, and black and white.
The female who is individual number 1 is a carrier and has inherited a recessive allele for the genetic trait. Hence her genotype will be XNXn.