Cross homozygous dominant tall plant and a heterozygous

What gametes can be formed from the following organism? Tt. Hh T= t =

What gametes can be formed from the following Straight-tailed, short-haired dog? Tt. Hh Use

Tt. Hh x TTHH TH TH Th t. H th T = straight tailed

TH TH TH Th t. H th TTHH TTHh Tt. HH Tt. Hh Straight,

If cross-pollinating a red snapdragon and white snapdragon produce all pink snapdragons: a. What

R = red W = white R W RR RW red pink RW WW

Can a type A mother and type B father have a child with type

What percent chance does a child have of being colorblind if the mother is

Feather length in ducks can be short or long. Choose a letter to use

An unaffected man marries a woman who is a carrier for Duchenne Muscular Dystrophy,

Slides: 32

Download presentation

Cross homozygous dominant tall plant and a heterozygous tall plant. a. What are the Parent genotypes? b. What are the F 1 phenotype frequencies? c. What are the F 1 genotype frequencies?

Cross homozygous dominant tall plant and a heterozygous tall plant. a. What are the Parent genotypes? b. What are the F 1 phenotype frequencies? c. What are the F 1 genotype frequencies? T = tall T = short T T TT TT tall Tt Tt tall a. TT and Tt b. All Tall c. 2 TT : 2 Tt

What gametes can be formed from the following organism? Tt. Hh T= t = H= h= straight-tailed curly-tailed short-haired long-haired

What gametes can be formed from the following Straight-tailed, short-haired dog? Tt. Hh Use the foil method: TH Th t. H th What are the genotype and phenotype ratios from crossing Tt. Hh with TTHH?

Tt. Hh x TTHH TH TH Th t. H th T = straight tailed t = curly tailed H = short haired h = long haired F 1 Phenotype ratio: F 1 Genotype ratio: TH

TH TH TH Th t. H th TTHH TTHh Tt. HH Tt. Hh Straight, short T = straight tailed t = curly tailed TTHH H = short haired h = long haired TTHh Tt. HH Tt. Hh Straight, short Straight, short TH TTHH TTHh Tt. HH Tt. Hh Straight, short F 1 Phenotype ratio: All straight-tailed All short-haired F 1 Genotype ratio: 4 TTHH 4 TTHh 4 Tt. HH 4 Tt. Hh

If cross-pollinating a red snapdragon and white snapdragon produce all pink snapdragons: a. What is the percent chance a white flower will result from the self pollination of one of the pink offspring? b. What kind of inheritance is this?

R = red W = white W W R R RW RW pink

R = red W = white R W RR RW red pink RW WW pink white a. 25% chance two pink-flowered plants produce a whiteflowered plant b. Type of inheritance: incomplete dominance

Can a type A mother and type B father have a child with type O blood? IA = A allele IB = B allele i = O allele Genotype possibilities for Type A mom: IAIA or IA i Genotype possibilities for Type B dad: IBIB or IB i

Can a type A mother and type B father have a child with type O blood? IA = A allele IB = B allele i = O allele Genotype possibilities for Type A mom: IAIA or IAi Ib Genotype possibilities for Type B dad: IBIB or IBi i Ia Ib Ibi Type AB Type B Ia i ii Type A Type O

What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was colorblind? What is mom’s genotype? What is dad’s genotype?

What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was colorblind? Problem 1: Carrier mother, Normal father What is mom’s genotype? X BX b XB What is dad’s genotype? X BY B B XB X X • • Daughters: 0% Sons: 50% Xb Y X BY Normal female Normal male X BX b X b. Y Carrier female Colorblind male

What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was colorblind? Problem 2: Carrier mother, Colorblind father What is mom’s genotype? XBXb What is dad’s genotype? Xb. Y

What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was a carrier? Problem 2: Carrier mother, Colorblind father What is mom’s genotype? b X X BX b What is dad’s genotype? BX b B X X X b. Y Carrier female • • Daughters: 50% Sons: 50% Xb X b Colorblind female Y X BY Normal male X b. Y Colorblind male

Feather length in ducks can be short or long. Choose a letter to use for the feather length gene. Determine which allele (short or long) is dominant and which is recessive. Supply the genotypes and phenotypes of the individuals in the pedigree. You will have five individuals where you only know one allele.

An unaffected man marries a woman who is a carrier for Duchenne Muscular Dystrophy, which is attributed to an X-linked gene. They have four children, one with Duchenne, one carrier daughter and a daughter and son who are unaffected. The child with Duchenne Muscular Dystrophy dies in childhood. The carrier daughter marries and has three children of her own, two of which are carriers and one of which is unaffected. a. Draw a pedigree for this family. b. What is the most likely sex of these two carrier children given the fact that they are unaffected by the X-linked gene?

An unaffected man marries a woman who is a carrier for Duchenne Muscular Dystrophy, which is attributed to an X-linked gene. They have four children, one with Duchenne, one carrier daughter and a daughter and son who are unaffected. The child with Duchenne Muscular Dystrophy dies in childhood. The carrier daughter marries and has three children of her own, two of which are carriers and one of which is unaffected. a. b. Draw a pedigree for this family. What is the most likely sex of these two carrier children given the fact that they are unaffected by the X-linked gene? -For a sex-linked recessive disorder, only females can be carriers. XD Y XD Xd Xd. Y or XDXD XD Xd XD Y XD XD XD Xd XD XD XD Y

Male Normal 44 none 2

Male Abnormal 44 XXY 3

Female Normal 45 Trisomy 21 2

Male Abnormal 45 Trisomy 18 2

Male Abormal 45 Trisomy 13 2