More Patterns of Inheritance. Incomplete Dominance A cross where neither allele is dominant over the...
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![Page 1: More Patterns of Inheritance. Incomplete Dominance A cross where neither allele is dominant over the other. The traits appear to be blended together.](https://reader035.fdocuments.us/reader035/viewer/2022062515/56649ced5503460f949bac04/html5/thumbnails/1.jpg)
More Patterns of
Inheritance
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Incomplete Dominance
• A cross where neither allele is dominant over the other.
• The traits appear to be blended together.
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• Ex. Snapdragon flowers• RR=Red• WW=white• RW=pink
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The Cream Dilution GeneIs white when homozygous.
What will it do to horses?
Bay is brown with black.
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CREAM and BROWN
produce New color: BUCKSKIN
brown with black.
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What Pattern of Color Inheritance Does this show?
Cream dilutes red-brownTo make….
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PALOMINO, a golden color.
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IncompleteIncompleteDominanceDominance
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Codominance• A cross where both alleles are equally expressed.
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• Ex. Horse Coats– CBCB=Brown coat– CWCW=White coat– CBCW=Roan coat: has both brown and white hairs.
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Co-dominance
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Andalusian Chickens
• Black feathers and white feathers are co-dominant. • Cross FB FB and FW FW and what will be produced?
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Andalusian Chickens
Q: Cross FB FB and FW FW and what will be produced?A: A Steel Blue Chicken FB FW
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Do this:
1.Cross a heterozygous red
rose with a homozygous
recessive yellow rose. Red
is the dominant allele.
What are the possible
colors of offspring?
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X
What will the offspring look like?
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2. A farmer is planning to
mate a bull and cow. The
male has a roan coat (brown
and white hairs) and the
female has a white coat
(white hairs). What might
their calves look like?
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X
What will the offspring look like?
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3. Your parents have decided to plant some snapdragons and want to know why there are three colors – red, pink and white. You volunteer to explain it to them by showing them the cross of 2 hybrid pink snap dragons – what are the possible offspring?
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4. You and your partner carry sickle cell trait.What are your chances of having a baby with
sickle cell anemia? Use RR for normal blood. RS for carriers and SS
for sickle cell anemia.
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Normal
Carrier
Sickle Cell Anemia
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5. Two heterozygous parents with free earlobes have 4 children predict the genotypes and phenotypes for the children’s ears.
F = free ear lobesff = attached ear lobes
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XHybrid
Hybrid
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XHybrid
Hybrid
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Warm-Up• No blurting – give everyone a chance
• Decide if the pictures are examples of:– Simple dominance– Incomplete dominance– Codominance
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Andalusian Chickens
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Warm-Up• Complete this problem in your journal:–If a man an a woman are having a baby, what are the chances the baby will be a boy? Use a Punnett Square to justify your answer. Hint: Think about which chromosomes a male has and which ones a female has
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Blood Types are an example of co-dominance
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Human Blood Types
Phenotype:The protein
Genotype:The genes
A IAIA or IAi
B IBIB or IBi
AB IAIB
O ii
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Blood type rules
• A is dominant over O• B is dominat over O• O is recessive to A and B• A and B are co-dominant to each other.
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• Genes that are located on the X sex chromosomes.
• Males will have one copy of the gene. Normal male- XB YAffected Male- Xb Y• Females Will have 2 copies of the gene:
Normal Female – XB XB
“Carrier” Female – XB Xb Affected Female – Xb Xb
X-Linked Genes
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Gender Determination• (Very few genes are found on the Y Chromosome)
• Only females can be carriers for sex-linked disorders on the X.
XY
Carrier – a person who transports the recessive allele but does not show the recessive trait. *Are they heterozygous or homozygous?*
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X Chromosome
• Recessive genes found there:– Colorblindness Xc
– Baldness Xb
– Hemophilia - bleeding disorder where blood won’t clot. Xh
A male with the XbY will have the recessive trait for baldness.
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Polygenic• A trait that is produced (controlled) by two or more genes
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Eye Color Example
• Controlled by at least three genes.• Act together to produce your eye color
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Lethal Genes
• Any genetic trait that causes death.Examples:Hemophilia- bleed to deathHuntington’s disease- brain shrinks
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Lethal Genes
Hemophilia (lethal and sex-linked) bleed to deathXhY
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Lethal Genes
Huntington’s disease- brain shrinks