Genotypes
Here are several genotypes: List all the genotypes that are homozygous and dominant.
HH, Hh, Hj, Mm, MM, Ll, Ii, ii, 00, Qq, Rr, RR, PP, pp
PP, RR, 00, MM, HH
What is the definition of a phenotype?
The physical trait(s) you can actually see.
Create a Punnett Square using this information. Bob is heterozygous for the bad attitude trait. Cindy is homozygous recessive for the good attitude trait.
B = bad attitude trait and b = good attitude trait
Mr. Raff created the correct Punnett Square on the board.
B would be ____________ and b would be _________ traits.
B = DOMINANT AND b = recessive
Write the genotype(s) for all combinations of these letters: H and h. There are three sets of combinations.
HH, Hh, hh These are genotypes that produce a phenotype.
Here are several genotypes. Which one are recessive and homozygous?
HH, Hh, Hj, Mm, MM, Ll, Ii, ii, 00, Qq, Rr, RR, PP, pp, nn, bb
bb, nn, pp, ii,
Complete this phrase: All phenotypes have a _____________ and all genotypes have a _____________.
Genotype / Phenotype
Create a Punnett Square. Both mother and father are heterozygous for mouth shape. There are two traits L = small compact mouth and l = large wide mouth.
See the board for the correct answer.
For single - gene traits controlled by a single gene
When the dominant trait on an allele is present along with another dominant trait on an allele what would the phenotype be? Dominant or recessive?
Two of the identical alleles on a gene yields the same trait.
What is the definition of genetics?
The study of heredity.
Here are several genotypes. Which ones are heterozygous and dominant?
HH, Hh, Hj, Mm, MM, Ll, Ii, ii, 00, Qq, Rr, RR, PP, pp, uu, Kk, Cc, Tt
Hh, Mm, Ll, Qq, Rr, Kk, Cc, Tt
Brown eyes dominant and blue eyes are recessive. If a person's genotype is BB. What is their phenotype?
Brown is the phenotype B=Brown which is dominant and b = blue. When the genotype is BB the eye color is Brown.
Create a Punnett Square and determine probabilities of the children. Use a homozygous genotype hh male and a heterozygous genotype Hh female. What percent of the children are heterozygous? What percent of the children are homozygous recessive?
50% heterozygous and 50% homozygous recessive.
For single - gene traits controlled by a single gene
What would someone's genotype appear to be if they were to display the recessive trait for a single-gene expressed trait? Please give an example of what the person's genotype would look like?
bb could be the recessive genotype for blue eyes
gg could be the recessive genotype for long fingernails.
Explain what a Karyotype is? Why would a geneticist create a Karyotype? This was last night's homework!
A means for a geneticist to find problems with chromosomes which might help the geneticist figure out if there is a genetic defect or not in the chromosomes. If so, further testing would be necessary.
Which ones of these genotypes are heterozygous and recessive?
Kk, Cc, Tt, mm, nn, jj, zz, yy, Yy, Bb,
NONE, With single-gene expressions there is no such category as heterozygous recessive. You can only have heterozygous recessive.
Y is for yellow skin and y is for pink skin. What are the genotypes and phenotypes for the homozygous individuals?
YY = yellow skin and yy = pink skin
A Punnett Square is made to determine the ___________ of what traits the children might have.
Remember: This s for single-gene expressions that we discussed in this unit.
Probability or chance
For single - gene traits controlled by a single gene
I have a genotype of Hh. H = dominant trait for dimpled chin and h = recessive for non-dimpled chin what would my phenotype be? What would I be homozygous or heterozygous for the trait?
Dimpled chin and I am heterozygous for the trait!!
Homozygous is defined as _____________
Homozygous is when to alleles on the same gene carry the same trait!!!!
According to the rules of assigning capital letters to dominate traits and lower case letters to recessive traits which genotype is impossible and would never be expressed as written?
HH, Hh, Hj, Mm, MM, Ll, Ii, ii, 00, Qq, Rr, RR, PP, pp, uu, Kk, Cc, Tt
Hj Is impossible and would never be written to express singe - gene expressions.
Y is for yellow skin and y is for pink skin. What are the genotype(s) and phenotype(s) for the heterozygous individuals? What color is the skin?
Yy is heterozygous and the dominant color is yellow. The skin color would be yellow. Yellow is dominant over pink skin color.
There are two homozygous parents they both have blue eyes. B=Brown eyes and b=blue eyes. Create a Punnett Square. How many of the children are heterozygous for brown eyes?
There are no children with brown eyes. All of the children have blue eyes because their genotype is bb which is homozygous recessive for blue eyes.
If there are two genes and four alleles that control a trait is this a single-gene expression?
No, single gene expressions are only controlled by a single gene or two alleles.'
Remember: For single - gene traits controlled by a single gene there are two alleles with either recessive or dominant traits
Define heterozygous __________
Heterozygous is when there are two different versions of a trait on the same gene. Each allele on the gene is different.