STAAR Biology Category 2 Review

Red is incompletely dominant to white in snapdragons. Which cross would result in 100% pink flowers?

• RR x rr

• rr x rr

• Rr x Rr

• RR x RR

Nudibranchs are marine gastropods that lack shells. Many of these gastropods retain the foul-tasting poisons of their prey and secrete them when threatened. The bright coloration of the nudibranchs warns predators to avoid them.

• They find enough food as they move through the marine environment

• They blend in with their environment to hide from predators

• They are not attacked by most predators and are able to reproduce successfully

• They have bright colors that attract a mate

According to the Punnett square in basic mendelian genetics: B reprepsents the dominant gene for blue feathers and b represents the recessive gene for red feathers. Two heterozygous birds have one offspring. What percent chance does it have for red feathers?

• 0%

• 25%

• 75%

• 100%

The Himalayan rabbit's habitat has cold, snowy winters and mild summers. The body is typically covered in white fur except for the nose, feet, tail, and ears, which are covered in black fur.

A scientist shaved an area of white fur on the back of a Himalayan rabbit and placed an ice pack over the shaved area . The shaved area grew black fur.

Which of these best explains why the hair that grew back where the Ice pack was placed was black and not white?

• The white hair mutated to black hair as the rabbit's body temperature decreased.

• The coat color changed from white to black with the age of the rabbit.

• The genes for black hair were activated by specific temperatures.

• White hair only grows during certain times of the year.

Color blindness is a recessive allele carried on the X chromosome. If this couple has a son, what are the chances that he is colorblind?

• 0%

• 25%

• 50%

• 75%

• 100%

Males of the bighorn sheep species fight one another to show females who is the dominant male and are more likely to mate with females.

• Natural Selection

• Mutation

• Genetic Drift

• Non-Random Mating

AB blood type is an example of what type of inheritance?

• complete dominance
• incomplete dominance
• codominance
• polygenic inheritance

Use your codon chart to match the DNA sequence TGA to the correct amino acid.

• Thr

• Ala

• Val

• Gly

1. Which two sets of animals share the most recent common ancestor according to the cladogram of vertebrate species?

• primates and birds

• crocodiles and amphibians

• ray-finned fish and primates

• Birds and crocodiles

What is the final result in meiosis?

• Two new daughter cells with the exact same chromosomes.

• Four new cells, each with half the chromosomes.

• Four new cells, each with twice the chromosomes.