2024 semester 2 Biology exam review

In a certain type of flower, red (R) is dominant to white (r) flower color. What is the probability of having homozygous red (RR) offspring?

• 0%

• 25%

• 50%

• 75%

• 100%

Select ALL that have eggs with shells (see cladogram).

• sharks

• primates

• birds

• amphibians

• crocodiles

Gg is ____ . gg is homozygous recessive. Both are examples of ______.

• homozygous dominant; phenotypes

• heterozygous; genotype

• heterozygous; phenotype

Which of these is a phenotype?

• JJ

• heterozygous

• tall

• homozygous

In humans, sperm and eggs each have the haploid number of ___ chromosomes. Heart cell have the diploid number of _____ chromosomes.

• 46;23

• 2;4

• 23;46

• 4;2

Refer to the pedigree. If child 3 is homozygous recessive and has straight hair line (gg), what is the genotype of both parents who have widow's peak?

• GG

• gg

• GO

• Gg

According to Darwin's theory of _____, individuals that tend to survive and reproduce are those that have genetic variations best suited to the environment

• geography

• natural selection

• acquired characteristics

• none of these

In which environment would the black moth be favored (survive best and reproduce most)?

• dark

• grey

• light

• all of these

Which of the following is a correct statement about the undisturbed geologic column of fossils?

Hint: Oldest at the bottom and youngest at the top

• The largest quantity of fossils are found in layer 2

• Fossils found in layer 1 are older than those in layers 3 and 4

• Layer 4 has the youngest fossils

• Fossils in layer 3 are younger than layer 4 but older than layer 2

Select ALL that are true of viruses.

• They reproduce, but only in a host cell

• They have genetic material (either DNA or RNA)

• They have cells

• They are living

• They are killed with antibiotics