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Bellringer   10/29 In  rabbits, white fur color (W) is dominant to black, and long ears Bellringer   10/29 In  rabbits, white fur color (W) is dominant to black, and long ears

Bellringer 10/29 In rabbits, white fur color (W) is dominant to black, and long ears - PowerPoint Presentation

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Bellringer 10/29 In rabbits, white fur color (W) is dominant to black, and long ears - PPT Presentation

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

dominant type blood white type dominant white blood tongue ratio hemophilia phenotypes recessive pink heterozygous red genotypes hair homozygous

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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?