14 Questions
What is the phenotypic ratio in the F2 generation when a red flowered Mirabilis jalapa plant is crossed with a white flowered plant?
1:2:1
Which chromosomal disorder is caused due to non-disjunction of the 21st chromosome?
Down syndrome
In the case of incomplete dominance, how does the phenotype of the F1 hybrid differ from that of the parental plants?
It shows an intermediate phenotype
What is the phenotypic ratio in the F2 generation for a trait showing co-dominance?
1:2:1
If a F1 hybrid is homozygous, what will be the phenotypic ratio when crossed with a homozygous recessive parent?
All offspring will show the recessive phenotype
How does co-dominance differ from incomplete dominance in terms of offspring phenotype?
In co-dominance, both parental traits are expressed simultaneously, while in incomplete dominance there is blending of traits.
जब पेड़ों को पानी अवशोषित करने की जरूरत होती है, तो वे किस प्रकार के पानी को अवशोषित करते हैं?
हाइग्रोस्कोपिक पानी
पौधों में पानी कौन सी स्थिति में अंकुरित होता है?
सम्मिश्रित पानी
मूल केश का संरचना से संबंधित समस्या का समाधान करें: मित्रनुल को सहेजने वाला प्रमुख संरचना कौन है?
स्टेले
किस रेखा के माध्यम से मूल बालों द्वारा पानी के अवशोषण की प्रक्रिया होती है?
कपिलेरी
मूल हेयर्स की संरचना में मित्रनुल, न्यूक्लियस, और वैक्यूल को क्या प्रकार से प्रदर्शित किया गया होता है?
स्थान
"पानी जीवन का अमृत" कहलाता है, और इसे महत्वपूर्ण बनाने वाली क्या विशेषता होती है?
महत्वपूर्णता
"गुरुत्वाकर्षक पानी" से संबंधित समस्या: मुख्य सुलझाव में से कौन-सा होता है?
"Absorption"
"कपिलेरी पानी" से संबंधित समस्या: 'प्रमुख' सुलझाव में से कौन-सा होता है?
"Transport"
Study Notes
- The text discusses topics from Biology-1 in the 12th class, focusing on important questions for various entrance exams, including JEE MAINS, MHT CET, and NEET.
- Topics covered in this text include genetics, specifically chromosomal features and dominance laws.
- Incomplete dominance is defined as a genetic condition where the phenotype of the offspring displays traits from both parents, but neither parent's trait is completely expressed.
- When a red-flowered Mirabilis jalapa plant is crossed with a white-flowered one, the F2 generation will exhibit a 1:1 phenotypic ratio (both red and white flowers).
- X and Y chromosomes differ in length and position of the centromere. X chromosomes are larger and have the centromere closer to the end, whereas Y chromosomes are smaller and have the centromere nearer to the middle.
- The Law of Dominance states that one allele masks the expression of another allele, resulting in only the dominant trait being visible.
- Back cross and test cross are two different genetic techniques. In a back cross, a hybrid is crossed back with one of its parent species, while in a test cross, a heterozygous organism is crossed with an organism having a recessive allele.
- Aberrations A, B, C, and D refer to various chromosomal abnormalities, such as deletion, duplication, inversion, and translocation.
- Non-disjunction of the 21st chromosome leads to Down syndrome, characterized by developmental delays, cognitive impairment, and physical growth delays.
- The X chromosome's label 'A' is indicated in the text.
- Satish, a colourblind boy, has a colourblind maternal grandfather and a normal vision mother. The pattern of inheritance suggests a recessive trait, with Satish inheriting the colourblind gene from both his maternal grandfather and mother.
- Mendel's experiments involved studying contrasting traits like height (tall and short) and seed shape (round and wrinkled) in pea plants.
- To determine if an F1 hybrid is homozygous or heterozygous, one must examine the F2 generation. If all offspring display the same trait, the hybrid is homozygous, but if the offspring exhibit a mix of traits, it is heterozygous.
Test your knowledge on biology topics from Class 12th, focusing on Chapter 3. Questions include definitions like incomplete dominance, phenotypic ratios in plants, and differentiation between X and Y chromosomes based on various characteristics.
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