Additional Double-Factor Inheritance Problems (two traits followed from one gene

Question

Additional Double-Factor Inheritance Problems (two traits followed from one generation to the next) 5. In horses, black color (B) dominates chestnut color (b). Trotting gait (T) dominates pacing gait (t). A cross is made between a horse homozygous for black color and pacing gait and a horse homozygous for chestnut color and trotting gait. List the probable genotype and phenotype of offspring resulting from such a Cross. Genotype phenotype 6. Humans may have Rh blood or Rh blood. A person with Rh (R) has a certain type of protein on the red blood cell. A person with Rh- (r) does not have this particular protein. In humans, Rh dominates Rh Normal insulin (I) production dominates abnormal insulin production (diabetes). If both parents are heterozygous for Rh and normal insulin production, what probable phenotypes would they produce in their offspring? 7.For this problem, use the information concerning the traits given in problem 6. The father is homozyg ous for Rh and has diabetes. The mother is Rh and homozygous for normal insulin production. What phenotype would their offspring show? 8. In certain breeds of dogs, black color is dominant and red color is recessive; solid color is dominant and white spotting is recessive. A homozygous black-and-white spotted male is crossed with a red-and-white spotted female. What is the probability of them producing a solid black puppy? 9. In humans, a type of blindness is due to a dominant allele; normal vision is the result of a recessive allele. Migraine headaches are due to a dominant allele. and normal (no headaches) is recessive. A male who is heterozygous for blindness and does not suffer from headaches marries a woman who has normal

Explanation / Answer

5 ans - BbTt Parental Genotypes (B black color dominatong chestnut color b) trotting gaits (T)dominating pacing gait(t)

Homozygous x Homozygous

      black pacer   chestnut trotter

BBtt    x    bbTT

Bt Bt Bt Bt bT   bT   bT   bT

cross between-

Genotype-all offspring-BbTt-

Phenotype-Black trotters in F1generation

-F2 generation will be 9/16 black & trotting; 3/16 black & pacing; 3/16 chestnut & trotting; and 1/16 chestnut & pacing-9:3:3:1

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