Question
34. Metallic color is dominant over dull color .Wings are dominant over no wings Cross a heterozygous metallic, winged dragon with a homozygous dull and no winged dragon. What are the genotypes & phenotypes?
Answer
4.1
(274 Votes)
Lucinda
Elite · Tutor for 8 years
Answer
Genotypes:1. MmWw (metallic, winged)2. Mmww (metallic, no wings)3. mmWw (dull, winged)4. mmww (dull, no wings)Phenotypes:1. Metallic, winged (MmWw)2. Metallic, no wings (Mmww)3. Dull, winged (mmWw)4. Dull, no wings (mmww)
Explanation
## Step1In this genetics problem, we have two traits in dragons: color (metallic vs dull) and presence of wings (wings vs no wings).### **Trait 1: Color**Metallic color (M) is dominant over dull color (m). A heterozygous dragon for this trait would have the genotype Mm (one dominant allele and one recessive allele).### **Trait 2: Wings**The presence of wings (W) is dominant over no wings (w). A heterozygous dragon for this trait would also have the genotype Ww.The dragon in question is heterozygous for both traits, so its genotype is MmWw.The dragon it's crossed with is homozygous recessive for both traits, so its genotype is mmww (dull and no wings).## Step2We use a Punnett square to determine the genotypes and phenotypes of the offspring. Each parent contributes one allele from each trait to their offspring.## Step3The genotypes resulting from this cross will be:- MmWw (metallic, winged)- Mmww (metallic, no wings)- mmWw (dull, winged)- mmww (dull, no wings)The phenotypes will be:- Metallic, winged (MmWw)- Metallic, no wings (Mmww)- Dull, winged (mmWw)- Dull, no wings (mmww)Given that metallic color and wings are dominant traits, any offspring with at least one M allele will be metallic, and any offspring with at least one W allele will have wings. Conversely, only offspring with two m alleles will be dull, and only those with two w alleles will have no wings.## Step4Each phenotype has an equal chance of occurring, as each genotype combination in the Punnett square is equally likely. Therefore, each phenotype (metallic, winged; metallic, no wings; dull, winged; dull, no wings) has a 25% chance of occurring.