In humans polydactylism having an extra finger on each hand is dominant to the typical 5finger arrangement Tongue rolling is dominant to not being able to roll ones tongue A man who is homozygous for 5fingers and who cannot roll their tongue has children with a woman who is het ID: 674777
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Slide1
Bellringer 10/29
In
rabbits, white fur color (W) is dominant to black, and long ears (L) are dominant to short. Draw a Punnett square that represents the cross between two rabbits heterozygous for both traits. What are the phenotype and genotype ratios
?
In
humans,
polydactylism
(having an extra finger on each hand) is dominant to the typical 5-finger arrangement. Tongue rolling is dominant to not being able to roll one’s tongue. A man who is homozygous for 5-fingers and who cannot roll their tongue has children with a woman who is heterozygous for
polydactylism
and tongue rolling. Draw a Punnett square that represents the cross. What is the probability the couple will produce a polydactyl baby who cannot roll their tongue
?Slide2
In rabbits, white fur color (W) is dominant to black, and long ears (L) are dominant to short. Draw a Punnett square that represents the cross between two rabbits heterozygous for both traits. What are the phenotype and genotype ratios?Slide3
In humans, polydactylism (having an extra finger on each hand) is dominant to the typical 5-finger arrangement. Tongue rolling is dominant to not being able to roll one’s tongue. A man who is homozygous for 5-fingers and who cannot roll their tongue has children with a woman who is heterozygous for
polydactylism
and tongue rolling. Draw a Punnett square that represents the cross. What is the probability the couple will produce a polydactyl baby who cannot roll their tongue?Slide4
Bell Ringer 4.14
Curly hair is recessive to straight hair. What is the probability of having an offspring with straight hair? (parents
heterozygous dominant mother and homozygous recessive father)
In order for a recessive trait to show, what must the genotype be?
How do some traits seem to skip a generation? (hint Mendel’s pea experiment)Slide5
Beyond MendelSlide6
Mendelian Inheritance (aka complete dominance)
When one trait is clearly dominant over another.
Mendel was very fortunate that all the pea plant traits that he studied exhibited complete dominance. Slide7
Incomplete Dominance
When neither allele is dominant over the other
The
heterozygote’s
phenotype is a
BLEND
of the two homozygous phenotypes.Slide8
P generation red x white
RR x WW
Genotypes:
Phenotypes:Slide9
F1
generation
pink x pink
_______ x _______
Genotypes:
Phenotypes:
Genotypic ratio:
Phenotypic ratio:Slide10
Codominance
When neither allele is dominant over the other BOTH alleles show up in the heterozygoteSlide11
P generation black x white
BB x WW
Genotypes:
Phenotypes:Slide12
Blood types are also codominant.
Antigen A
Antigen A & B
Antigen BSlide13
AB blood type x AB blood type ___________ x __________
Genotypes:
Phenotypes:
Genotypic ratio:
Phenotypic ratio:Slide14
Incomplete Dominance or Codominance?
Birds can be blue, white, or white with blue-tipped feathers.
Flowers can be white, pink, or red.
A sneech can be tall, medium, or short.
A bleexco can be spotted, black, or white.
A Hoo can have curly hair, spiked hair, or a mix of curly and spiked hair.Slide15
Multiple Alleles when three or more alleles code for one trait
ex: blood type has three alleles
(O is recessive)
Genotype
Phenotype
I
A
I
A
(AA)
A
I
A
i
(AO)
A
I
B
I
B
(BB)
B
I
B
i
(BO)BIAIB (AB)ABii (OO)OSlide16
Homozygous male type B x heterozygous female type A
___________ x ___________
Genotypes:
Phenotypes:
Genotypic ratio:
Phenotypic ratio:Slide17
Male type O x female type AB___________ x ___________
Genotypes:
Phenotypes:
Genotypic ratio:
Phenotypic ratio:Slide18
If a boy has a blood type O and his sister has blood type AB, what are the genotypes and phenotypes of their parents?Slide19
Sex-linked Traits / X-linked TraitsLocated on the X chromosome (NOT Y!)
Examples: hemophilia, color blindnessSlide20
Trait: Hemophilia
H = no hemophilia h = hemophilia
(normal male) x (female carrier)
X
H
Y x
X
H
X
h
HH = no hemophilia
Hh
= no hemophilia
Hh
= hemophilia
XY = male
XX = femaleSlide21
Most sex-linked, recessive traits – including hemophilia and color blindness – appear in males. This phenomenon is best
explained by which statement?
Males have an X chromosome with dominant genes.
Most of the genes on the X and Y chromosomes of males are recessive.
In males, the recessive sex-linked genes appear only on the Y chromosome.
In males, the Y chromosome lacks the genes needed to mask the recessive genes on the X chromosome.Slide22
A couple has five children, all with blood type A. The mother’s blood type is O, and the father’s blood type is A. Based on this information, which describes the most probable
genotype of the father?
Diploid
Haploid
Heterozygous
Homozygous Slide23
Some flowers show incomplete dominance. If RR = white and R’R’ = red, which phenotypic ratio would be expected in the offspring of two pink flowers?
1 red : 2 pink : 1 white
0 red : 4 pink : 0 white
3 red : 0 pink : 1 white
4 red : 0 pink : 0 whiteSlide24
Agenda for Today… 4.14
Fingerprint Lab
Paper
Partner
#2 Pencil
Piece of Tape
READ THE DIRECTIONS!
Make sure both partners do their fingerprints
Put both names on the paper
You may wash your hands at the sink when complete
Check List
Bell Ringer
Beyond Mendel
Finger Print Lab
Blood Type W/S
Unit Guide
Homework (due tomorrow)
See me.. Slide25
TOTDWhy is type O considered the universal blood type?