A dog gives birth to 5 puppies. The allele for black feet in a species of duck is dominant to the allele for brown feet. Genotypes: BB, Bb, bb. What percentage of chromosomes does each puppy share with its mother? The answer is "bb x bb" because in all the other scenarios, the black gene would be dominant over the blue gene in at least one offspring. The answer is "75% black feet and 25% brown feet" because phenotypes are the physical expression of an allele pair and the dominant allele for black feet will overpower the allele for brown feet. Color Expression: Animals have different colors. One is black and one is black with brown spots. Seventy-five... See full answer below. Question: Two heterozygous white (brown fur is recessive) rabbits are crossed. The phrase "homozygous dominant" means the genotype of one parent is BB while "heterozygous" is a genotype of Bb.
Parent's genotypes are Bb and Bb andn the offsprings genotypes after crossing them will be BB, Bb and bb while phenotypes of 3 white rabbits and 1 brown. In poodles, the allele for black fur (B) is dominant to the gene for brown fur (b). It bears Reginald C. Punnett's name, who developed the method in 1905.
All offspring are expected to have black fur because all offspring will have at least one dominant allele for black fur which will overpower any allele for brown fur. This disease is usually caused by a dominant allele. The dominant color is determined by a type of alleles present in an organism. The answer is 50% because each puppy shares 50% of chromosomes with its mother and 50% with its father. 50% long necks and 50% short necks. The allele for longer necks in giraffes is dominant to the allele for shorter necks. What are the phenotypes of the cross between two homozygous parents, one with a long neck and one with a short neck?
The parents' rabbits have the following genotypes: |W||w|. A rat with the genotype BB is crossed with a rat with the genotype Bb. Answer and Explanation: 1. What are the phenotypes of the offspring from the cross shown in the punnet square above? A homozygous dominant crossed with a homozygous recessive parent is shown below. Learn more about this topic: fromChapter 17 / Lesson 24. Assume B is white, b is recessive brown; Bb x Bb. In a population of rats at a pet store, the allele for black fur is dominant (B) and the allele for brown fur is recessive (b). Our experts can answer your tough homework and study a question Ask a question. The following punnet square shows the results. 50% BB, 25% Bb, 25% bb. The genotypes of a specific cross or breeding experiment are predicted using the Punnett square, a square diagram.
What are the resulting percentages of genotypes of a cross between a homozygous dominant parent and a heterozygous parent? The sum of a person's attributes or observable characteristics is their phenotype. What percentage of the offspring are expected to have black fur? Example Question #10: Punnett Squares. 75% black feet and 25% brown feet. For which of the following parental genotypes would 100% of offspring be expected to be blue? Become a member and unlock all Study Answers. A person's genotype is made up of all the alleles they have for a certain gene. Homozygous recessive and heterozygous.
Two poodles are crossed. Since both parents had to have homozygous recessive alleles for blue eyes in order to express them, they both must have "tt" for a genotype.