What does the term 'heredity mean' ?
Study of transmission of characteristics ( resemblances as well as variations ) from one z•eneration to the next is known as heredity.
Define genetics.
Genetics is the study of various traits and genes and how they are inherited from one generation to next.
What are chromosomal mutations ? Name the types of chromosomal mutations.
They are mutations which involve changes in the structure and number of chromosomes. Chromosomal mutations are of two types - genomatic and aberrations. Sometimes chromosomal mutations are equated with chromosomal aberrations. The four types of chromosomal mutations are deletion, duplication, inversion and translocation.
Why is a man unable to pass a sex linked gene to his son ?
It is only the X-chromosome on which a sex linked gene is present.
- Genotype of males is XY and that of females is XX.
- During gamete formation only sperms with X-chromosomes will have the genes. Now, the son with genotype XY will get X - chromosome from mother and Y from father.
Hence a man is unable to pass a sex linked gene to his son.
Why did Mendel choose garden pea plants for his studies ?
Pea is a self pollinating plant in nature and can be easily and artifically cross pollinated.
- Has a number of contrasting characters.
- Fertile hybrid plants can be obtained as a result of cross pollination. - Convenient to handle.
- Has short life cycle
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