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Chapter 18

ANSC 101 Chapter Notes - Chapter 18: Zygosity, Probability Distribution, Genetic Code


Department
Animal Science
Course Code
ANSC 101
Professor
Dr.Moyes
Chapter
18

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ANSC 101 Chapter 18 Genetics
Chromosomes
- Genetic material in every cell
- Species specific
Turkeys: 41 pairs
Horses: 32 pairs
Cattle: 30 pairs
Humans- 23 pairs
Swine- 19 pairs
Mitosis vs. Meiosis
Mitosis
- Cell replication
- 2 daughter cells identic to parents
- Fully paired chromosomes
Meiosis
- Gametogenesis
Spermatogenesis
Mitosis (cell replication)
- From primordial germ cell to primary spermatocyte to secondary spermatocyte
Meiosis (cell division)
- Primordial/Secondary spermatocyte to spermatids to functional sperm
- Spermiogenesis
- Sperm carry single chromosomes
Oogenesis
Mitosis
- Primary germ cell to primary oocyte to secondary oocyte
Meiosis
- Secondary oocyte to ovum (egg)
- Ova carry single chromosomes
Polar bodies die, reabsorbed.
Fertilization: Formation of diploid zygote from haploid sperm and ovum (diploid paired
chromosomes)
Key reminders about genetic concepts
- Each parent contributes one-half of an offspring's genotype
- Chromosomes occur in pairs
- Genes are segments of chromosomes
- The location of a gene on a chromosome
is the locus
- Each chromosome is a double helixstructure of DNA
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