Mathematical formula for determining probability of a homozygous recessive progeny

Related BrainMass Solutions

• Rabbits: Determining phenotypic ratios using double crosses

  Individuals homozygous for either one or both of the nonfunctional recessive allels, a or b, are deaf. a. If a large number of matings were made between two double heterozygotes, what phenotypic ratio would be expected in the progeny? b.

• % of traits passed to progeny

  49681 % of traits passed to progeny The average pea pod contains about 7 peas. The gene for smooth peas is dominant over the gene for wrinkled peas.

• Cross between homozygous squash fruits and expected F2 results

  Yellow color is controlled by dominant gene R and green color by recessive allele r. Draw a cross between the homozygous squash fruits and summarize the expected results of F2.

• Estimation of phenotypes by interference and gene map data

  A fly with black body, purple eyes and vestigial wings is crossed with a fly homozygous for gray body, red eyes and normal wings. The female progeny are then crossed with males that have black bodies, purple eyes, and vestigial wings.

• Mendel's Law and Genetics

  The green, wrinked phenotype must be recessive The progeny I must have a 1:1 ratio of yellow to green. This is an example of Mendel's first law (equal segregation). The cross must have been a heterozygote X homozygous recessive.

• Genotypic and phenotypic ratios in hair texture in dogs.

  Wire hair in dogs is dominant over its recessive allele for smooth hair. A cross between heterozygous wire haired individuals produces F1 which are then test crossed. Determine from the expected progeny their phenotypic and genotypic ratios.

• Mendel/Punnett Square/Genotypes

  Response: A homozygous condition means that both alleles are identical. Therefore, the homozygous long-leafed plant would have a genotype of SS since "S" is the allele for producing long-leafs.

• An allele that has no noticeable effect on the appearance of an organism unless it is found in the homozygous condition is

  You won't notice recessive alleles unless the organism is homozygous for both recessive alleles.) 3) TRUE/FALSE Sexual reproduction provides less variation among individuals in a population than does asexual reproduction.

• Determining Genotypes

  If we want to calculate the probability based on genotype of the grandparents as well: the mother has a 50% chance of being a carrier, and the child has 50% chance of getting either X-chromosome, therefore the probability is 0.5 x 0.5 = 0.25 = 25% for