Genetics Practice Word Problems

Word Problems What is the genotype of a Homozygous Dominant (purebred) individual? Use the letter T. Draw out the offspring possibilities if two purebred dominant individuals were crossed.

Word problems A dog owner breeds a dog with spots and a dog without spots. Knowing the spots are recessive, what is the genotype of the dog with spots. Use the letter “S” or “s” for your answer.

Word problems 2. Black fur (B) is dominant to white fur (b). If the mother is homozygous recessive and the father is homozygous dominant, what are the genotypes of the parents?

Word Problems 2 b. What is the probability that the offspring will be heterozygous? (Mother is homozygous recessive, and the father is homozygous dominant. B= black fur, b= white fur).

Word Problems 2c. What is the probability that the offspring will have black fur? (Mother is homozygous recessive, and the father is homozygous dominant. B= black fur, b= white fur).

Word problems 3. In certain feline species, brown fur (B) is dominant to orange fur (b). If you cross 2 cats with orange fur, what is the probability that the offspring will have orange fur?

Word problems 4. In a specific plant species, flat seeds (F) are dominant and round seeds (f) are recessive. If Parent 1 is homozygous dominant and Parent 2 is heterozygous, what is the ratio of the offsprings’ genotypes?

Word problems 5. Use the Punnett square provided to find the genotype of the missing parent. (Dimples are dominant (D) and no dimples is recessive (d). ? D DD Dd d dd

Word problems 6. In a certain species of pine trees, short needles (N) are dominant to long needles (n). If Parent 1 is homozygous recessive, what would the genotype of Parent 2 need to be in order to have 50% of offspring with long needles.

Word problems 7. In a certain species of plant, the color red (R) is dominant to the color white (r). What would the genotypes of the parents have to be if you wanted a white flower from 2 red parents?