Heredity — Flashcards
Karnataka Board · Class 10 · Science
20 flashcards for Heredity (Karnataka Board Class 10 Science) to test yourself on key terms and facts. Sample: "Why do children look similar to their.
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Why do children look similar to their parents but not exactly identical?
Answer
Children inherit genetic material (DNA) from both parents, getting one copy of each gene from mother and father. This creates similarities due to shared genes, but the unique combination of maternal a…
A farmer crosses tall pea plants (TT) with short pea plants (tt). What will be the height of F1 generation plants and why?
Answer
All F1 plants will be tall (Tt). Though they inherit one 'T' from tall parent and one 't' from short parent, tallness is a dominant trait. Only one copy of dominant allele 'T' is needed to express the…
What is a gene and how does it control traits like plant height?
Answer
A gene is a section of DNA that provides information to make a specific protein. For height, genes control enzymes that produce growth hormones. Efficient enzymes → more hormone → tall plant. Less eff…
How to determine if attached earlobes are dominant or recessive in your family?
Answer
1. Observe earlobe types in family (attached vs free) 2. Record parents' and children's earlobe types 3. If both parents have attached earlobes but child has free earlobes, then attached is recessive …
Why don't asexually reproducing organisms show as much variation as sexually reproducing ones?
Answer
Asexual reproduction creates identical copies with only minor DNA copying errors causing small variations. Sexual reproduction combines genetic material from two parents, creating much greater diversi…
In Mendel's F2 generation of tall×short cross, calculate the phenotype ratio if 800 plants are produced.
Answer
F2 ratio is 3:1 (tall:short) Tall plants = 3/4 × 800 = 600 plants Short plants = 1/4 × 800 = 200 plants Genotype ratio: 1 TT : 2 Tt : 1 tt TT = 200, Tt = 400, tt = 200 plants…
What happens during independent assortment in a dihybrid cross (tall, round × short, wrinkled)?
Answer
F1: All tall, round (TtRr). F2: Four phenotypes in 9:3:3:1 ratio: - 9 tall, round - 3 tall, wrinkled - 3 short, round - 1 short, wrinkled Traits for height and seed shape are inherited independently…
Why do human males determine the sex of offspring and not females?
Answer
Females have XX chromosomes and always contribute X to offspring. Males have XY chromosomes - they contribute either X (producing XX = girl) or Y (producing XY = boy). Since male's contribution determ…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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