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CHF201C3
CHF 201 Chapter 3 Flashcards
Question | Answer |
---|---|
Genes | segment of DNA that contain genetic information |
Chromosome | DNA molecule that carries several thousand genes |
Gametes | Human Reproductive Cells |
Ovulation | release of ovum from ovary about fourteen days after the beginning of each menstrual period |
Conception occurs in | Fallopian tubes |
Zygote | union of ovum |
Dizygotic twins | two ova that are fertilized by two sperm |
Monozygotic | twins have identical genes because they were formed from one zygote that split into two identical organisms very early in development |
Body cells | reproduce by process of mitosis |
Reproductive cells | divide by process of meiosis. In this case, the sperm or ovum receives only one member of each chromosome pair |
Genotype | Actual genetic potential |
Phenotype | result of interaction of genes and environment |
Additive Pattern | Each gene affecting a specific trait makes an active contribution to the final outcome |
Multifactorial traits | Characteristics produced by the interaction of several genetic and environmental influences |
Polygenic traits | Characteristics produced by the interaction of many genes |
Dominant – Recessive Pattern | Dominant are those which, when combined with a recessive gene, will be expressed in the phenotype |
X-linked recessive genes | located on only the X chromosome |
GENETIC COUNSELING | , some negative effects can be avoided or minimized |