Complete the following table that summarizes the 4 basic genetic crosses (B=Biac
ID: 59240 • Letter: C
Question
Complete the following table that summarizes the 4 basic genetic crosses (B=Biack. b=Brown) If true-breeding short stem pea plants are crossed true-breeding tall stem pea plants. % of the plants. and all of the plants wouVd have tal stems Hint: tali stems are dominant. Choose the correct answer and explain why. Pl. P2 ) Parental. F2 F2. Parental F2.F1 Explain: Abnormal eye shape in Drosophila may be caused by a variety of mutant genes, dominant or recessive, sex- linked or autosomal. One normal-eyed Drosophila melanogaster male from a true-breedng normal stock was crossed to two different abnormal-eyed females with the for owing results: Assume that you have two recessive traits in dogs, fetching and sitting on command: the fetching trait wtnch g fetches and G does not. and the sitting on command trait in which d sits on command and D does not You cross a mate and female that both fetch and sit and have the genotypes GgDd.What fraction of the offspring will neither fetch nor Sit? What fraction of the off spring imO be GGdd?' '"What wiil be the phenotype of these puppies? What fraction of the offspring will not fetch but will sit on command? '"What are the possible genotypes for these puppies?Explanation / Answer
8. BB x Bb
Genotypic ratio : 2 BB : 2 Bb or 1:1
Phenotypic ratio : 1 [ as there is just one phenotype]
9. First let's find the F1 and F2 generations for this cross- AA * aa
F1 will be all Aa i.e. all tall
Now cross between Aa x Aa to get the F2 generation.
3/4th are tall .
So the answer is option D - F2, F1.
B B B BB BB b Bb Bb