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Read the following four statements (A - ...

Read the following four statements (A - D) and find the number of wrong statements
1. The characters blend in the heterozygous condition during Mendelian inheritance .
2. Change in a single base pair of DNA does not cause mutation .
3. Cancer cells can show chromosomal aberrations.
4. In insect, sex chromosomes in the male are ZZ and in females are ZW.

A

Two

B

Three

C

Four

D

One

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each of the four statements (A - D) and determine how many of them are incorrect. ### Step 1: Analyze Statement A **Statement A:** "The characters blend in the heterozygous condition during Mendelian inheritance." - **Analysis:** This statement is incorrect. According to Mendel's laws, particularly the law of segregation, the traits do not blend in the heterozygous condition. Instead, one trait is dominant over the other, and the recessive trait can reappear in the next generation. ### Step 2: Analyze Statement B **Statement B:** "Change in a single base pair of DNA does not cause mutation." - **Analysis:** This statement is also incorrect. A change in a single base pair can lead to a mutation, known as a point mutation. An example is sickle cell anemia, which results from a single base pair change in the hemoglobin gene. ### Step 3: Analyze Statement C **Statement C:** "Cancer cells can show chromosomal aberrations." - **Analysis:** This statement is correct. Cancer cells often exhibit chromosomal abnormalities, which can lead to uncontrolled cell growth and cancer development. ### Step 4: Analyze Statement D **Statement D:** "In insects, sex chromosomes in the male are ZZ and in females are ZW." - **Analysis:** This statement is incorrect. Insects typically follow the XX/X0 sex determination system, where males have one less chromosome than females. The ZZ/ZW system is characteristic of birds, not insects. ### Conclusion Now, we summarize the correctness of each statement: - Statement A: Wrong - Statement B: Wrong - Statement C: Correct - Statement D: Wrong Thus, there are **3 wrong statements** (A, B, and D). ### Final Answer The number of wrong statements is **3**. ---
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