Question

10. A green-leafed fuzzywhatsit (I made this plant up) is crossed with a fuzzywhatsit with yellow-striped leaves. The cross produces 185 green-leafed fuzzywhatsits. What were the genotypes of both parents? • Summarize the genotypes & phenotypes of the offspring that would be produced by crossing two of the green-leafed fuzzywhatsits obtained from the initial cross. 11. In dogs, there is a hereditary deafness caused by a recessive gene, "d." A kennel owner has a male dog that she wants to use for breeding purposes if possible. The dog can hear, so the owner knows his genotype is either DD or Dd. If the dog's genotype is Dd, the owner does not wish to use him for breeding so that the deafness gene will not be passed on. This can be tested by breeding the dog to a deaf female (dd). • Draw the Punnett squares to illustrate these two possible crosses. In each case, what percentage/how many of the offspring would be expected to be hearing? Deaf? How could you tell the genotype of this male dog? Also, using Punnett square(s), show how two hearing dogs could produce deaf offspring.

Answer 1

The answer of above questions are given in image below.

(GG) O Green leafed & yellow striped leaves ' 699) 185 Green-leased (this is given in question and this will possible only when Green leased are present in homozygous condition. GG X gg Gg Gg Gg Gg Call green

if Green leased are present in hetsozygous condition then Gg Gg gg gg C Green and yellow striped both will be produced). So genotype of both parents will be GG for gren deafed fuzzy what sit and gg for yellow-striped " " Green leafed fuzzy chod sit produced by another initial cross big. Gg x Gg games> ☺ ☺ ☺ offsprings GG GG Gg gg Genotype GG! Gg gg = 1.211 Phenotype Green leaf: yellow stripped a) 31

11.

de sucessine (can't hear). ① D > dominant 2 cases will be • DD X dd gametes 0 0 0 D D Dd xdd d Dd Dd d Dd od All will hear Since all have Dallel cohich is dominant so 100% dogs will hear, All 4 will hear d Dddd dDddd Dal hear sol. dd deaf. 50% & 2 will be deaf & 2 will hear. Since when dog have Dl genotype, the aroma offsprings also deafness and when dog hame bo genotype, Asprin and will hear. And the owner knew the genotype of dog. When two hearing dogs are in hetrozygous condition then they produce deaf offspring. Dd x Dd Do lod and will be deaf- Dd Idd

Two