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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 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
slide6

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

slide7
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

slide8
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

slide9
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

slide21
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

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?
which punnett square is worked out correctly1

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?
slide28

Based on the pedigree shown, how many

Daughters do the original parents have?

1

slide29

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

slide30

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?

on a separate sheet of paper
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
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