Bio 1020 Exam #2 Practice

Which one of the following IS NOT an important feature of photosynthesis?

• release of oxygen gas

• absorption of light by pigment molecules

• production of "food" (e.g., glucose)

• conversion of light energy into proteins

Your laboratory observations of photosynthesis involved spinach leaf discs that floated after they were exposed to light. Why did these discs float?

• Light caused photosynthesis to release oxygen gas to make the discs float.

• Light caused photosynthesis to release carbon dioxide to make the discs float.

• The warmth of the light caused air to flow into the discs, making them buoyant.

Which of the following are used by both humans and insects?

• Alveoli

• epiglottis

• spiracles

A blastocyst is a structure that is formed in the early development of mammals. It

occurs after a zygote has undergone several rounds of cellular division. Are the cells in a blastocyst haploid or are they diploid?

• Diploid

• Haploid

Which of the following statements about cell division is FALSE?

• Meiosis occurs in all cells.

• Synapsis does not occur during mitosis.

• The original cell in meiosis is diploid.

• Mitosis produces 2 daughter cells.

The diploid number for zebras is 46 chromosomes (2n=46). How many chromosomes are in the gametes of a zebra?

A female mouse that is heterozygous for brown hair mates with a male mouse and they produce a litter of 4 mice. Three of the mice are brown and one is white. What was the phenotype of the male mouse?

• White

• Brown

• Heterozygous

• Cannot tell for certain

Which of the following is the term used to describe the most common phenotype in a population?

• Dominant

• Homozygous

• Monohybrid

• Wild Type

Amona sends in her DNA for a genetic test and is surprised to learn that she is a carrier for cystic fibrosis. If she has a child with someone who has cystic fibrosis, what is the probability that their child WILL NOT have cystic fibrosis? [Write your answer as a fraction or percentage; do not write a ratio.]

How many affected males are indicated in this pedigree?

• 3

• 6

• 4

• 2