2025- Biology Pre-Exam Review

Front

What is the closest relative to humans based on hemoglobin comparison?

Back

Chimpanzees have the fewest amino acid differences with humans.

Front

What is the percentage of homozygous recessive offspring in a typical Mendelian cross?

Back

50% of the offspring will be homozygous recessive.

Front

What is the first organism in a food chain?

Back

The first organism in a food chain is ALWAYS a producer.

Front

What percentage of the offspring will be purebred dominant in a typical Mendelian cross?

Back

25% of the offspring will be purebred dominant.

Front

Which two organisms are most closely related?

Back

Equus caballas (Horse) & Equus burchellii (Zebra) are most closely related.

Front

Define 'producer' in an ecosystem.

Back

A producer is an organism that can make its own food, typically through photosynthesis.

Front

What is a 'consumer' in an ecological context?

Back

A consumer is an organism that obtains energy by feeding on other organisms.

Front

What is a 'decomposer'?

Back

A decomposer is an organism that breaks down dead or decaying organisms, returning nutrients to the ecosystem.

Front

Explain the concept of homozygous and heterozygous genotypes.

Back

Homozygous means having two identical alleles for a trait, while heterozygous means having two different alleles.

Front

What is the significance of genetic variation in a population?

Back

Genetic variation is important for the survival and adaptability of a population.