Question

16 multiple choice 1 point in a dihybrid cross, r is normal for adenine, r is mutant for adenine and shows red color, t is normal for tryptophan and t is mutant for tryptophan. which of the following combinations is expected to grow and show a red color on mv medium? hart/hbrt hart/hbrt hart/hbrt hart/hart

Explanation:

To solve this, we analyze the requirements: grow (needs normal for tryptophan, so T) and red color (mutant for adenine, so r). Let's check each option:

• HArT/HBrT: Genotype has r (mutant adenine, red) and T (normal tryptophan, can grow).
• HART/hBRT: Has R (normal adenine, not red) – eliminate.
• HArT/HBRt: Has t (mutant tryptophan, can't grow) – eliminate.
• Hart/HArt: Likely has t (mutant tryptophan, can't grow) and maybe R? – eliminate.

So the correct combination is the one with r (red) and T (grow).

Answer:

HArT/HBrT