✓ Board-verified
Biology · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 3 · Q28
Study the pedigree chart of a family given below and answer the questions that follow: (a) Is the disease in this pedigree chart a recessive or…
Study the pedigree chart of a family given below and answer the questions that follow :
(a)
Is the disease in this pedigree chart a recessive or dominant disorder ? Give reason.
(b)
Identify the female individual in this family, who for sure is homozygous.
(c)
Genotype of which one individual cannot be identified in this pedigree chart ?
(d)
Identify a male who is definitely heterozygous.
(e)
Is this disease a sex-linked or an autosomal disorder ?
Marking-scheme solution
(a) •Recessive
Individuals $\displaystyle 1$ and $\displaystyle 2$ don't have disease but their offspring individual $\displaystyle 3$ shows the disease.
(b) Individual $\displaystyle 3$ is homozygous
(c) Individual $\displaystyle 7$/$\displaystyle 8$
(d) Individual $\displaystyle 2$/$\displaystyle 5$
(e) Autosomal disorder
All Principles of Inheritance and Variation questions2023 question paperNCERT solutions: Principles of Inheritance and VariationPractice Principles of Inheritance and Variation →
More from Principles of Inheritance and Variation
- In which of the given chromosomal disorders does the individual have tall stature with feminised character?2024
- In the following figure, two ways of pairing of two homologous pairs of chromosomes are shown. Which of the following phenomena is expressed?2026
- Study the figures given below and answer the questions. Cross - A Cross - B Identify in which of the crosses the strength of linkage between the…2026
- Inheritance of which of the following traits is shown in the cross given below? Choose the correct option from the following:2025
- If both the parents are carriers for thalassaemia, the chances of an afflicted child to be born to them is:2024
- Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent?2025
- Which of the following features correctly show the mechanism of sex- determination in honey-bees? (i) A zygote formed from the union of a sperm and…2025
- A Snapdragon plant bearing pink colour flowers is crossed with a Snapdragon plant bearing white colour flowers. Their F_1 progeny will show:2024
CBSE Class 12 Biology past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.