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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.

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What are the x and y chromosomes called
What are the X and Y chromosomes called? through a family?

  • Sex chromosomes


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

  • carrier


X but can pass it to it’s offspring?b

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


Red but can pass it to it’s offspring?green 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


Red but can pass it to it’s offspring?green 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


Red but can pass it to it’s offspring?green 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
What gender determines the sex of an offspring? but can pass it to it’s offspring?

  • Male


What is the gender of this karyotype
What is the gender of this karyotype? but can pass it to it’s offspring?

Male


What genetic condition does this person have
What genetic condition does this person have? but can pass it to it’s offspring?

Down Syndrome


What is the gender of this karyotype1
What is the gender of this karyotype? but can pass it to it’s offspring?

Male


Is this karyotype considered normal
Is this karyotype considered “normal”? but can pass it to it’s offspring?

No


How many blood types are there
How many blood types are there? but can pass it to it’s offspring?

  • A

  • B

  • AB

  • O


What is true about the y chromosome compared to the x
What is true about the Y chromosome compared to the X? but can pass it to it’s offspring?

It is shorter than the X






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

  • 25%


Which punnett square is worked out correctly

X chance that their child will inherit the genetic autosomal condition?B

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?


Which punnett square is worked out correctly1

X chance that their child will inherit the genetic autosomal condition?

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?





Based on the pedigree shown, how many II-7?

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 - children with hemophilia?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 children with hemophilia?

the child?

Father


On a separate sheet of paper
On a separate sheet of paper children with hemophilia?

  • 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


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