CBSE 2024-25 Competency-Based Questions With Answers: The Central Board Of Secondary Education has made available the competency-based questions on its official website. Students can take a look at these competency-based questions as these questions can help them to solve real-world situations with the help of practical knowledge. For the current academic year 2024-25, the competency-based questions are provided in this article.
1. In mice, brown fur is dominant and white fur is recessive. A biologist crossed a brown fur male with a white fur female and obtained two brown fur and two white fur offspring. Which of the following statements is MOST likely to be true?
A. Both parents are heterozygous.
B. Only the male parent is homozygous.
C. Only the male parent is heterozygous.
D. Only the female parent is heterozygous.
2. In which of the following processes would genetic variation occur?
P) mutation in liver cells
Q) development of a zygote to an embryo
R) gene flow from one population to another
A. only P
B. only Q
C. only P and Q
D. only P and R
3. Which of the following was a reason that Mendel's experiments showed reproducible results?
use of mathematical logic use of large sample sizes
use of true breeding parental lines
use of pea plants that had a quick growth time
Kernel colour in wheat ranges from dark red to white depending on the number of dominant alleles in the genotype of the plant as shown below.
| kernel colour | no. of dominant alleles |
| dark red | 4 |
| medium red | 3 |
| intermediate red | 2 |
| light red | 1 |
| white | 0 |
Assuming that a cross is performed between a homozygous dominant male and a homozygous recessive female, answer the questions that follow.
4. What will be the kernel colour of offspring in the F1 generation?
A. white
B. dark red
C. medium red
D. intermediate red
5. How many genes code for kernel colour in wheat?
A. 1
B. 2
C. 4
D. (Cannot say from the information provided)
6. What would be the ratio of kernel colours in the F2 generation?
A. 1:2:1
B. 9:3:3:1
C. 1:4:6:4:1
D. 1:6:15:20:15:6:1
7. Which of the following phenomena is/are exhibited by alleles coding for kernel colour in wheat?
P) co-dominance
Q) incomplete dominance
R) polygenic inheritance
A. only P
B. only R
C. only P and R
D. only Q and R
8. In a cross between pea plants having round green seeds (RRGG) and wrinkled yellow seeds (rrgg), what percentage of eggs will carry both the round and green alleles for the F2 generation?
A. 9%
B. 93%
C. 64%
D. 25%
9. Which of the following processes helped scientists corroborate Mendel's findings much after he had discovered them?
A. recombinant DNA technology
B. DNA transcription
C. DNA replication
D. cell division
10. Marfan syndrome is a connective tissue disorder in humans caused due to the mutation of the FBN1 gene coding for fibrillin-1. Some symptoms of this disease are abnormally long limbs, heart murmurs, and extreme nearsightedness. Marfan syndrome is an example of this.
A.a chromosomal disorder
B.polygenic inheritance
C.codominance
D. pleiotropy
To get the answers to all these questions, we are providing a free PDF to download from the link below.
Comments
All Comments (0)
Join the conversation