Types of Dominance Complete Dominance Genetic crosses that
Types of Dominance Complete Dominance Genetic crosses that result in the dominant phenotype being shown due to a dominant gene being present. Ex: Tallness is dominant. Crossing a homozygous dominant pea plant (TT) with a homozygous recessive pea plant (tt) results in F1 offspring all having a dominant gene (Tt) These problems use the same letter (T) T T t
Tt Tt t Tt Tt Incomplete Dominance When some alleles are neither dominant nor recessive. One allele is not stronger than the other. Phenotypes are blended together.
Uses TWO letters Crossing a red flower (RR) with a white flower (WW) creates pink flowers (RW). R W W R RW RW RW
RW Co-dominance When both of the phenotypes are visibly seen. Phenotypes do NOT blend, they are both seen. Uses TWO letters Ex: In a breed of chickens, the allele for black feathers is co-dominant with the allele for white feathers. Black (BB) father and White (WW) mother produced Black AND white (speckled) baby chicks B B
W BW BW W BW BW Example 1 In mice, the two most common colors seen
are brown (BB) and white (WW). How would you cross a brown mouse with a white mouse to get a cream-colored mouse? What type of dominance is this? What is the probability of getting a cream colored mouse from this cross? Example 2 In certain breeds of salmon, there are fish with the A allele for scales (Aa) and without scales (aa). When you cross the two breeds, some fish end up with scales, some dont. What type of dominance? Whats the probability
of getting a fish with scales? Example 3 You have identified a new species of grasshopper that come in two different colors: ones with red stripes (RR) and ones with yellow stripes (YY). When you cross them you get a grasshoppers with red and yellow stripes. What type of dominance is this? What will the offspring look like? Example 4 A species of chickens color is determined by CODOMINANT genes. A Heterozygous (BW) chicken is crossed with a Homozygous (BB) chicken: Complete a Punnett Square for this cross What color is the Heterozygous (BW) parent chicken?
What color is the Homozygous (BB) chicken? What is the probability that a black chick will be born? What is the probability that a white chick will be born? What is the probability that a black AND white chick will be born? What is the probability that a GREY chick will be born? What is the genotypic ratio for this cross? What is the phenotypic ratio for this cross? Example 5 A species of flowers color is determined by INCOMPLETELY DOMINANT genes. R is for Red and W is for White. A Heterozygous (RW) flower is crossed with a Homozygous (RR) flower: Complete a Punnett Square for this cross What color is the Heterozygous parent flower? What color is the Homozygous (RR) parent flower? What is the probability that a Red flower will be made?
What is the probability that a White flower will be made? What is the probability that a Red AND White flower will be made? What is the probability that a PINK flower will be made? What is the genotypic ratio for this cross? What is the phenotypic ratio for this cross? Multiple Alleles Sex-Linked Genes Multiple Alleles A gene (characteristic) with more than two alleles is said to have multiple alleles. Ex: coat color in rabbits, blood types.
Most characteristics weve dealt with so far have two alleles (R and r). Multiple Alleles have more than two (ex: A, B, O in blood types). ***There can be multiple alleles for a certain trait, but each individual STILL ONLY HAS 2 ONE FROM MOM, ONE FROM DAD.**** Polygenic Traits A trait that is controlled by two or more genes (each with two alleles) Ex: AaBbCc Polygenic inheritance usually shows up as a range of variation such has height, skin color or eye color. Human Blood Types
Human Blood Types There are 4 different blood phenotypes A B AB O 3 alleles are in the pool instead of just two (A, B, O) You still only get ONE from Mom and ONE from Dad. Genotypes for blood type ALLELE CODES FOR
IA IB i Type A Blood Type B Blood Type O Blood Type O is the recessive blood type, which is why it gets a lowercase (i). Genotypes & Phenotypes of Blood Genotype
A A II A Ii A B II B B II B Ii ii Phenotype Type A - Homozygous
Type A - Heterozygous Type AB - Heterozygous Type B - Homozygous Type B - Heterozygous Type O Homozygous recessive Example Problem: Dad is homozygous for Type A blood. Mom is heterozygous for Type B blood. Do a Punnett Square to find out the offspring. IB A I
A I A B II IAIB What are the new genotypes? Phenotypes? i A
Ii IAi IAIB IAi IAIB IAi Type AB Type A Type AB Type A Blood Donors & Receivers
Sex Linked Traits Sex Linked Genes We each have two sex chromosomes (one donated from mom, one donated from dad. Females: X Males: X X Y Genes on the first X chromosome are shared traits between the sexes, and is inherited from your mother.
Genes on the Y chromosome contain very few instructions (primarily just for male development). Sex-Linked Disorders Two of the most common sex-linked disorders are Colorblindness Hemophilia The genes that cause these disorders is located on the X chromosome (usually passed from mother to son) This makes it very rare for a colorblind father to pass the gene onto his son.
Sex-linked Genotypes Genotype Codes for: XRXR Female Homozygous Dominant R r XX Female Heterozygous Dominant
XrXr Female Homozygous Recessive R XY Male Dominant r Male Recessive XY
Example Problem: Colorblindness is an X-linked recessive disorder. Show a cross between a heterozygous mother and a father who is colorblind. Xr What are the new genotypes? Phenotypes? Y R R r
XX XY r X rX r X rY X X R
XRXr (F) Not Colorblind XRY (M) Not Colorblind XrXr (F) Colorblind XrY (M) Colorblind
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