Genetics Exam 1 – 40 MCQs with Correct Answers | Inheritance, Probability, Gene Expression – 2025/2026

Genetics Exam 1 2025/2026 Exam
Questions with 100% Correct Answers |
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Which of the following most directly controls an organism's phenotype:

a. transcription

b. translation

c. protein function

d. mutation


e. replication - 🧠 ANSWER ✔✔c. protein function


Who first realized that blending inheritance was not compatible with

evolution by natural selection?

,a. Charles Darwin

b. Walter Sutton

c. Calvin Bridges

d. Theodor Boveri


e. Gregor Mendel - 🧠 ANSWER ✔✔a. Charles Darwin


The haploid number of chromosomes in humans is 23. How many

chromosomes and chromatids are present in a secondary oocyte?

a. 23 chromosomes, 23 chromatids

b. 23 chromosomes, 46 chromatids

c. 46 chromosomes, 46 chromatids

d. 46 chromosomes, 92 chromatids


e. 92 chromosomes, 92 chromatids - 🧠 ANSWER ✔✔b. 23 chromosomes,

46 chromatids

In a diploid organism, what stage of the mitotic cell cycle has the same

number of chromosomes as a gamete?

a. G1

b. S

, c. G2

d. metaphase


e. none of the above - 🧠 ANSWER ✔✔e. none of the above


When does S phase occur during meiosis?

a. Before prophase I

b. During prophase I

c. During anaphase I

d. Before prophase II


e. In gametes - 🧠 ANSWER ✔✔a. Before prophase I


Aa BB cc Dd ee ff x Aa bb Cc Dd EE FF

How many different types of gametes can the parent on the right produce?

a. 2

b. 4

c. 8

d. 16


e. 32 - 🧠 ANSWER ✔✔c. 8


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