Chapter 21 Vocabulary

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texasgrl1978
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273860
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Chapter 21 Vocabulary
Updated:
2014-05-09 11:33:36
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Development Hereditary
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Development and Hereditary
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  1. Loss of an embryo or fetus before the 20th week of pregnancy
    abortion
  2. One member of the gene pair that controls a given trait.
    allele
  3. Fluid filled sac that surrounds and cushions the developing fetus.
    amniotic sac
  4. A chromosome not involved in sex determination. There are 44 autosomes (22pairs) in humans.
    autosome
  5. Individual who has a gene that is not expressed but that can be passedto offspring.
    carrier
  6. Dark-staining, threadlike body in a cell’s nucleus; contains genes thatdetermine hereditary traits.
    chromosome
  7. Referring to a gene that is always expressed if present.
    dominant
  8. Developing offspring during the first 2 months of pregnancy.
    embryo
  9. Union of an ovum and a spermatozoon.
    fertilization
  10. Developing offspring from the third month of pregnancy until birth.
    fetus
  11. Hereditary factor; portion of the DNA on a chromosome
    gene
  12. Genetic make-up of an organism.
    genotype
  13. Period of development from conception to birth.
    gestation
  14. Transmission of characteristics from parent to offspring by means of thegenes; the genetic makeup of the individual.
    heredity
  15. Having unmatched alleles for a given trait; hybrid.
    heterozygous
  16. Having identical alleles for a given trait; purebred.
    homozygous
  17. Hormone produced by embryonic cells soon after implantation that maintainsthe corpus luteum.
    human chorionic gonadotrophin (hCG)
  18. Embedding of a fertilized ovum into the uterine lining.
    implantation
  19. Secretion of milk
    lactation
  20. Process of cell division that halve the chromosome number in theformation of the reproductive cells.
    meiosis
  21. Change in gene or chromosome.
    mutation
  22. Hormone from the posterior pituitary that causes uterine contraction andmilk ejection (“letdown”) from the breasts.
    oxytocin
  23. Childbirth; labor.
    parturition
  24. All the characteristics of an organism that can be seen or tested for.
    phenotype
  25. Structure that nourishes and maintains the developing fetus duringpregnancy.
    placenta
  26. Offspring, descendent.
    progeny
  27. Referring to a gene that is not expressed if a dominant gene for thesame trait is present.
    recessive
  28.  Referring to a gene carried onasex chromosome, usually the X chromosome.
    sex linked trait
  29. Characteristic
    trait
  30. Structure that connects the fetus with the placenta; contains vesselsthat carry blood between the fetus and placenta.
    umblical cord
  31. Fertilized ovum; cell formed by the union of a sperm and egg.
    zygote

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