23 BIO SOL Units 11+12

Front

What is a homozygous dominant genotype?

Back

A genotype consisting of two identical dominant alleles, represented as 'BB'.

Front

What does it mean for two organisms to be closely related?

Back

They have very similar DNA sequences.

Front

What are the possible genotypes of offspring from a cross between a homozygous dominant (AA) and a homozygous recessive (aa) individual?

Back

100% Aa.

Front

What are vestigial structures?

Back

Body parts that have lost their original function through evolution, such as the hind leg bones in whales.

Front

Which layer of rock is typically the oldest?

Back

The bottom layer, often referred to as layer 4 in a stratigraphic sequence.

Front

Define genotype.

Back

The genetic constitution of an individual, represented by alleles.

Front

Define phenotype.

Back

The observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What are homologous structures?

Back

Anatomical features in different species that share a common ancestry, such as the forelimbs of humans and whales.

Front

What are analogous structures?

Back

Body parts in different species that serve similar functions but do not share a common ancestry, like wings of birds and insects.

Front

What is natural selection?

Back

The process by which organisms better adapted to their environment tend to survive and produce more offspring.