Consider the genetic cross for absent-mindedness, which is a dominant trait. All of the offspring from this cross will be absent-minded. If two parents that are absent-minded have offspring that are not, what MUST be the genotypes of the parents?

In the same cross as question #1, what fraction of the offspring will have their father's genotype for both traits?

In pea plants, flower color is determined by one gene with two alleles, with the allele coding for purple flowers (P) being dominant to the allele coding for white flowers (p). If two purple-flowered offspring resulting from a cross between homozygous dominant and white-flowered parents are crossed, what percentage of the progeny are expected to have the dominant phenotype?

Red flowering plant are crossed with white flowering plant. The offspring shows: 1 red: 2 pink: 1 white. What are the genotypes of the parents?

Three different genes determine the coat colour of cats. One of the genes controls the black-based coat colour. There are three alleles for black-based coat colour genes with the following order of dominance: black (B) > chocolate (bch) > cinnamon (bc). Two black cats were crossed. The offspring produced were three black kittens and one chocolate kitten. Which of the following rows identifies the possible genotype(s) of the parents? Select one: a. Parent 1 Parent 2 Bbch Bbch b. Parent 1 Parent 2 Bbch Bbc or Bbch c. Parent 1 Parent 2 Bbc Bbch d. Parent 1 Parent 2 B__ Bbch

Mendelian Genetics Consider blue eyes in a man as recessive to brown eyes. Show the expected children of a marriage between a blue-eyed woman and brown-eyed man who had a blue-eyed mother. Determine the genotypic ratio (GR) and phenotypic ratio (PR) of the F1 using Punnett Square Method. Hint: Determine the genotypes of each individual first.

Brown hair(B) is dominant over blond.  Brown eyes (F) are dominant over blue eyes (f).  A woman who is homozygous for blond hair and Brown eyes marries a heterozygous for Brown hair and has blue eyes.  What does the dihybrid cross look like.  What would be the genotypes and phenotypes for the offspring

*Ms. Libby Davison bought three Congo Lily bulbs at a flower show after she was told they were each from different inbred lines. One had red flowers, on yellow flowers, and one white flowers. She determined that flower color was controlled by three alleles at a single gene. Red was found to be codominant with yellow, and both alleles dominant to white. Some of the crosses she made and the resulting progeny are listed below: Progeny All red Cross Red (selfed) Yellow (selfed) White (selfed) Red x yellow Yellow x white Red x white Orange (selfed) 1 red: 2 orange: 1 yellow a. Designate each allele with an appropriate gene symbol. All yellow All white All orange All yellow All red b. Identify all possible genotypes of the following phenotypes i. Red ii. Yellow Taken from Introduction to genetic analysis 7 edition. 1999. Griffiths et al. Chapter 4. iii. White iv. Orange c. Determine the expected phenotypes and their ratios in the progeny from each of the following crosses. i. Orange x white…

What cross will result in a ratio of 3 dominant phenotype offspring for every 1 recessive offspring?  What cross will result in a 1:2:1 genotype ratio in the offspring?  What cross will result in all homozygous recessive offspring?