Q1. Perform the Genetic Cross below and include the answers to questions below (20 points)

Background

Topic: Mendelian Genetics

This question tests your understanding of dominant and recessive alleles, homozygous and heterozygous genotypes, and how to use a Punnett Square to predict offspring genotypes and phenotypes.

Key Terms and Formulas:

• Dominant allele: An allele that masks the effect of a recessive allele (represented by uppercase letter, e.g., R).

• Recessive allele: An allele whose effect is masked by a dominant allele (represented by lowercase letter, e.g., r).

• Homozygous: Both alleles are the same (RR or rr).

• Heterozygous: Two different alleles (Rr).

• Punnett Square: A diagram used to predict the outcome of a genetic cross.

Step-by-Step Guidance

1. Identify the genotypes of the parents: One is homozygous dominant (RR), the other is homozygous recessive (rr).

2. Set up a Punnett Square with RR and rr as the parent genotypes.

3. Fill in the Punnett Square to show the possible genotypes of the offspring.

4. Determine the phenotype ratio based on the genotypes in the Punnett Square.

5. Stop here and try to complete the Punnett Square and phenotype ratio yourself!

Try solving on your own before revealing the answer!

Q2. What is the cellular/organismal result of a successful genotype/phenotype outcome?

Background

Topic: Genetics and Phenotype Expression

This question is about how genotype determines phenotype and what happens at the cellular or organismal level when a genotype successfully expresses a phenotype.

Key Terms:

• Genotype: The genetic makeup of an organism.

• Phenotype: The observable traits or characteristics.

• Gene expression: The process by which information from a gene is used to synthesize a functional product (protein).

Step-by-Step Guidance

1. Recall that genotype codes for proteins via gene expression.

2. Proteins produced determine the observable phenotype.

3. Consider how the phenotype manifests at the cellular or organismal level (e.g., pigment, enzyme activity).

4. Think about how this outcome can affect the organism's survival or reproduction.

Try solving on your own before revealing the answer!

Q3. Cellular respiration is carried out by which organelle?

Background

Topic: Cell Biology

This question tests your knowledge of organelles and their functions, specifically which organelle is responsible for cellular respiration.

Key Terms:

• Cellular respiration: The process of breaking down glucose to produce ATP.

• ATP: Adenosine triphosphate, the energy currency of the cell.

• Organelle: Specialized structure within a cell.

Step-by-Step Guidance

1. Recall the main organelles in eukaryotic cells: nucleus, mitochondria, chloroplast, etc.

2. Identify which organelle is known as the "powerhouse" of the cell.

3. Think about which organelle produces ATP through cellular respiration.

Try solving on your own before revealing the answer!

Q4. Which process is responsible for the production of oxygen during photosynthesis?

Background

Topic: Photosynthesis

This question tests your understanding of the steps in photosynthesis and which step produces oxygen.

Key Terms:

• Photosynthesis: The process by which plants convert light energy into chemical energy.

• Light-dependent reactions: The stage of photosynthesis where light energy splits water molecules.

• Oxygen production: Occurs when water is split during the light-dependent reactions.

Step-by-Step Guidance

1. Recall the two main stages of photosynthesis: light-dependent and light-independent reactions.

2. Identify which stage involves splitting water molecules.

3. Consider what happens to the oxygen atoms from water during this process.

Try solving on your own before revealing the answer!

Q5. Which chemical group in DNA holds a negative charge that helps it travel toward the gel's positive pole?

Background

Topic: Molecular Biology

This question tests your understanding of DNA structure and gel electrophoresis.

Key Terms:

• DNA: Deoxyribonucleic acid, the molecule that carries genetic information.

• Gel electrophoresis: A technique used to separate DNA fragments by size and charge.

• Phosphate group: The part of DNA that carries a negative charge.

Step-by-Step Guidance

1. Recall the structure of DNA: sugar-phosphate backbone and nitrogenous bases.

2. Identify which part of the DNA molecule is negatively charged.

3. Think about how this negative charge affects movement in an electric field during gel electrophoresis.

Try solving on your own before revealing the answer!

Q6. Fill in the blanks: Stomata are pores in plant leaves that permit gas exchange, especially oxygen and carbon dioxide.

Background

Topic: Plant Biology

This question tests your knowledge of plant anatomy and the function of stomata.

Key Terms:

• Stomata: Small openings on the surface of leaves.

• Gas exchange: The movement of gases like O2 and CO2 in and out of plant tissues.

Step-by-Step Guidance

1. Recall the location and function of stomata in plant leaves.

2. Think about which gases are exchanged through stomata.

3. Consider how stomata help plants maintain homeostasis.

Try solving on your own before revealing the answer!