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Ch. 10 Study Module

Terms in this set (25)

The synaptonemal complex ____________
physically connects homologous chromosomes during prophase 1
How many genes are present in the human genome?
Tens of thousands
Fertilization produces a ______
diploid zygote
a Karyotype is a ______
photograph of all of an individual's chromosomes
Which of the following occurs during anaphase II?
Sister chromatids separate and migrate toward opposite poles
A human cell containing 22 autosomes and a Y chromosome is a ______________ .
sperm
Homologous chromosomes move toward opposite poles of a dividing cell during _____________
meiosis I
Crossing over occurs during ___________
prophase I
How many pairs of autosomes do humans have?
22
Synapsis occurs during ___________
prophase I
Which event occurs only during prophase I of the first meiotic division?
Synapsis of homologous chromosomes occurs.
Which of the following statements best describes the advantage that sexual reproduction likely provides over asexual reproduction?
Although energetically more costly than asexual reproduction, sexual reproduction leads to different combinations of alleles that could provide adaptabililty in changing environment.
Which of the following contributes to genetic variation in sexually reproducing species?
Independent assortment, crossing over, and random fertilization
In a diploid cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing ____________ chromosomes.
5
Which of the following human cells contain 46 chromosomes?
Liver cells
How many different combinations of maternal and paternal chromosomes can be packaged in gametes made by an organism with a diploid number of 8 (2n=8)?
16
Which of the following is included in alternation of generations?
All of the listed responses are correct
In a diploid set of chromosomes, one member of each pair of homologous chromosomes is derived from the father (paternal) and the other comes from the mother (maternal). If 2n=6, what is the probability of obtaining a gamete in which all the chromosomes are paternal ones?
1/8
Sister chromatids ___________
are identical copies of each other formed during DNA synthesis
What is a locus?
The precise location of a gene on a chromosome
In sexually reproducing species, the chromosome number remains stable over time because ______________ and ________________ always alternate.
meiosis; fertilization
Human somatic cells contain ___________ set(s) of chromosomes and are therefore termed ____________
2; diploid
Spores and gametes differ in that ____________
gametes must fuse to form a zygote and continue development, but each spore can develop into an independent multicellular organisms on its own
The egg (ovum) of a rabbit contains 22 chromosomes. How many chromosomes are in the somatic (body) cells of a rabbit?
44
In a male mammal, every germ cell that undergoes meiosis in the production of gametes give ruse to ________________ sperm.
4
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