Chapter 13 Flashcards
Meiosis
a special type of cell division that produces cells with half the chromosomes of the parent cell.
Only occures in specializd cells like the ovaries and testes
How many chromosomes do humans have ?
46
Fertilization
unites a sperm and an egg, reestablishing pairs of homologous chromosomes, with both paternal and maternal genes
Heredity
The transmission of traits from one generation to the next
Variation
Sons and daighters are not idential copies of their parents, there are some differences
Genetics
The study of heredity and variation
Genes
Coded information in the form of heredity units
Gametes
Reproductive cells in plants and animals
Vehicles that transmit genes from one generation to another
Somatic cells
All cells of the body except the gametes
Locus
A genes specific location along the length of a chromosome
Asexual reproduction
a single individual is the sole parent and passes copies of all its genes to its offspring without the fusion of gametes
Virtually exact copies of parent
Clone
an individual or group of individuals that are identlical to the parent
Sexual reproduction
Two parents give rise to offspring that have unique combinations of genes inherited from two parents
Not exact replica’s but have similar traits
Life cycle
the generation to generation sequence of stages in the reproductive history of an organism from conception to production of its own offspring
Karyotype
Images of chromosomes are arranged in pairs, starting with longest chromosome