Genetics review part 2
Sponsored Links
This presentation is the property of its rightful owner.
1 / 32

Genetics Review Part 2 PowerPoint PPT Presentation


  • 51 Views
  • Uploaded on
  • Presentation posted in: General

Genetics Review Part 2. If a characteristic is sex-linked, it occurs more frequently in _______. Males. What is a diagram that shows how a characteristic is passed through a family?. Pedigree. What are the X and Y chromosomes called?. Sex chromosomes.

Download Presentation

Genetics Review Part 2

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Genetics ReviewPart 2


If a characteristic is sex-linked, it occurs more frequently in _______.

  • Males


What is a diagram that shows how a characteristic is passed through a family?

  • Pedigree


What are the X and Y chromosomes called?

  • Sex chromosomes


What is an individual that doesn’t express a given trait but can pass it to it’s offspring?

  • carrier


Xb

Y

XB

Xb

Redgreen color blindness is a sex-linked recessive trait . In a family the father is color blind and the mother is a carrier.

Show your work for this cross


Redgreen color blindness is a sex-linked recessive trait . In a family the father is color blind and the mother is a carrier.

What is the genotype for the father?

XrY


Redgreen color blindness is a sex-linked recessive trait . In a family the father is color blind and the mother is a carrier.

Out of 4 children, how many girls would be expected to be color blind?

1


Redgreen color blindness is a sex-linked recessive trait . In a family the father is color blind and the mother is a carrier.

Out of 4 children, how many boys would be expected to be color blind?

1


What gender determines the sex of an offspring?

  • Male


What is the gender of this karyotype?

Male


What genetic condition does this person have?

Down Syndrome


What is the gender of this karyotype?

Male


Is this karyotype considered “normal”?

No


How many blood types are there?

  • A

  • B

  • AB

  • O


What is true about the Y chromosome compared to the X?

It is shorter than the X


What causes an organism to receive too many or too few chromosomes?

  • nondisjunction


Sex-linked genes refer to what chromosome?

  • X


How many chromosomes does a person with Down Syndrome have?

  • 47


A male can produce sperm that is either ___ or ___.

  • X Y


If both parents carry the recessive allele what is the chance that their child will inherit the genetic autosomal condition?

  • 25%


XB

XB

XB

XB

XB

Xb

XB

XB

XB

XBXB

XBXB

XBXB

XBXB

XBXB

XBXB

Y

Y

Y

XBY

XBYB

XBY

XBY

XbY

XBY

Which Punnett Square is worked out correctly?


X

X

X

X

X

X

XX

XX

XX

X

X

X

XX

XX

XX

Y

Y

Y

XY

XY

XX

XY

XY

XX

Which Punnett Square is worked out correctly?


_____________is a mutation where an organism has an extra chromosome.

  • Trisomy


Males have the sex chromosomes…

XY


Based on the pedigree shown, what is the genotype of person II-7?

Bb


Based on the pedigree shown, how many

Daughters do the original parents have?

1


Why are there more male children with hemophilia than female children with hemophilia?

Hemophilia is linked to the x chromosome, so males need only 1 recessive gene to get hemophilia while females need both recessive genes


Sample pedigree - cystic fibrosis

1. What can we say about I-1 and I-2?

2. What is the inheritance?

3. What are the odds that III-5 is a carrier?

4. What is the relationship between I-1and III-4?

5. Which individuals are affected with cystic fibrosis?


Which parent determines the gender of

the child?

Father


On a separate sheet of paper

  • Draw a pedigree that represents Julie married to Jeff, with one daughter, Josephine. Josephine married Joseph and had Jason and Joe. Joe married Julia and had Shannon and fraternal twin boys, Mark and Alex. Mark married Alison and had Ray and Scarlet. Please label the pedigree with the names of the people.

  • The individuals in red are affected with an autosomal recessive disorder. Please indicate the genotypes of each person in this pedigree


  • Login