▶️ Answer/Explanation
Correct Answer: B
To determine the probability, cross the genotypes Tt (Parent 1) and tt (Parent 2). The Punnett square yields two possible genotypes for the offspring: Tt and tt. Specifically, 50% of the offspring will be Tt (carrying the dominant allele for polydactyly), and 50% will be tt (normal). Since the polydactyly allele (T) is dominant, any kitten with at least one T will express the trait. Thus, there is a 2 out of 4 or 50% chance that an offspring will have extra toes.
▶️ Answer/Explanation
Natural selection relies on the principle that individuals with traits better suited to their environment are more likely to survive and reproduce. In a habitat where food is located high up in trees, giraffes with slightly longer necks had a significant survival advantage over those with shorter necks. This competition for limited resources meant that “better-adapted” individuals passed their favorable genes to the next generation. Over many generations, this lead to the evolution of the long-necked giraffes we see today. Option (B) describes artificial selection, while (C) and (D) contradict the environmental pressures required for this specific trait to evolve.
✅ Answer: (A)
✅ Answer: (A)
▶️ Answer/Explanation
Natural selection relies on the existence of differences between individuals in a population, known as genetic variation. Without these differences, every individual would have the same chance of survival, and no specific traits could be “selected” over others. When resources are limited, individuals with advantageous variations are more likely to survive and reproduce. Options (B) and (C) actually hinder natural selection, as plenty of resources reduce competition and identical offspring lack the variety needed for adaptation. Option (D) describes artificial selection, not natural selection.
✅ Answer: (A)
✅ Answer: (A)