Biology Inheritance Principle part 47 (Questions 4) class 12 XII | Summary and Q&A

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May 12, 2015
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Biology Inheritance Principle part 47 (Questions 4) class 12 XII

TL;DR

This video discusses the principles of inheritance, including dominant and recessive traits, and provides examples through genetic crosses.

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Questions & Answers

Q: How are different traits denoted in genetics?

In genetics, different traits are denoted using genotype symbols. For example, hornlessness can be denoted by small p, while hotness can be denoted by capital p.

Q: What are the possible genotypes of the offspring when a hornless bull is crossed with a cow?

When a hornless bull is crossed with a cow, the possible genotypes of the offspring depend on the genotype of the bull. It can be homozygous (capital T capital T) or heterozygous (capital T small p), resulting in hornless calves.

Q: How is dominance determined in genetics?

Dominance in genetics is determined by observing which trait is expressed in the F1 generation. If all offspring display a particular trait, it is considered dominant. In the video, the spotted trait is dominant over the solid trait.

Q: How many homozygous spotted rabbits and solid colored rabbits are expected in the F2 generation?

In the F2 generation, three-fourths of the offspring are expected to be spotted, while one-fourth is expected to be solid colored. Therefore, there is a possibility of 8 homozygous spotted rabbits and all solid colored rabbits being homozygous.

Summary & Key Takeaways

  • The video explains how to denote different traits, such as hornlessness and hotness, using genotype symbols.

  • It discusses the outcomes of genetic crosses between a hornless bull and different cows, showing the inheritance of horned and hornless calves.

  • The video also explains how to determine the dominance of traits through a cross between a spotted rabbit and a solid colored rabbit.

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