Unit 5 & 6 AP Biology CED Review

Which of the following is a predicted ratio of a dihybrid cross?

• 9:3:3:1

• 9:3:4

• 1:2:1

• 1:1:1:1

Snowshoe hares are brown in summer and white in winter, describe this event.

• Hares undergo phenotypic plasticity & environment influences gene express

• Hares are white in winter due to the snow binding to hair follicles

• Hares are brown from exposed dirt in summer

• Hares remain hidden in the winter months inhibiting fur darken from sun

What is the sequence of nucleotides on mRNA read in triplets called?

• anticodon

• codon

• triplet box

• wobble

Describe the cause of a cross resulting in greater than 50% parental phenotypes and less then 50% recombinant phenotypes

• Genes are linked on the same chromosome

• Genes are located on different arms of the same chromosome

• Gene are on different chromosomes

• Gene are found in different gametes

Identify which of the following best describes purines and pyrimidines.

• Purines (C, T, & U) have single ring, Pyrimidines (A & G) have double ring

• Purines (C, T, & U) have double ring, Pyrimidines (A & G) have single ring

• Purines (A & G) have single ring, Pyrimidines (C, T, & U) have double ring

• Purines (A & G) have double ring, Pyrimidines (C, T, & U) have single ring

Describe why a male is more likely to be affected by a sex-linked trait?

• Males have only 1 Y chromosome

• Females have only 1 Y chromosome

• Males have only 1 X chromosome

• Females have only 1 X chromosomes

Which of the following does NOT increase variation in gamete formation?

• crossing over

• fertilization of gametes

• random assortment of chromosomes

• condensation of chromatin

Which of the following genetic engineering techniques is incorrectly described?

• Electrophoresis separates molecules based on size & charge

• Bacterial transformation introduces DNA to bacterial cells

• PCR allows for DNA fragments to be stabilized for engineering processes

• DNA sequencing determines the order of nucleotides in a DNA molecule

Describe the process of nondisjunction.

• Homologous chromosomes exchange genetic information

• The alignment of the chromosomes on the metaphase plate

• Homologous chromosomes or sister chromatids remain attached during anaphase

• The process of sperm and egg fusing to create a zygote

Which enzyme is responsible for joining the fragments on the lagging strand?

• helicase

• DNA polymerase

• topoisomerase

• ligase