Chapter 21
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Alleles | One of two or more different genes for a particular characteristic
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| Amnion | An embryonic membrane that holds the fetus suspended in amniotic fluid; fuses with the chorion by the end of the third month ofgestation
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| Amniotic fluid | The fluid contained within the amnion; cushions the fetus and
absorbs shock
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| Autosomes | Chromosomes other than the sex chromosomes; for people there are 22 pairs of autosomes in each somatic cell
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| Cleavage | The series of mitotic cell divisions that take place in a fertilized egg; forms the early multicellular embryonic stages
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| Embryo | The developing human individual from the time of fertilization until the eighth week of gestation
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| Genotype | The genetic makeup of an individual; the genes that are present
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| Gestation | The length of time from conception to birth; the human gestation period averages 280 days
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| Heterozygous | Having two different alleles for a trait
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| Homologous pair | A pair of chromosomes, one maternal and one paternal, that contain genes for the same characteristics
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| Homozygous | Having two similar alleles for a trait
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| Implantation | Embedding of the embryonic blastocyst in the endometrium of the uterus 5 to 8 days after fertilization
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| Labor | The process by which a fetus is expelled from the uterus through the vagina to the exterior of the body
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| Parturition | The act of giving birth
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| Phenotype | appearance of the individual as related to genotype; the expression of the genes that are present
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| Sex chromosome | The pair of chromosomes that determines the gender of an
individual; designated XX in females and XY in males
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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