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13 terms

Meiosis

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When a sperm and egg combine, the resulting embryo has..
half of the mother's genetic information and half of the father's
Some plants are triploid. If a plant has a haploid chromosome number of 42, how many chromosomes are present in its somatic cells?
126
If a cell has a diploid number of 50, how many chromosomes are present in the nucleus at the beginning of meiosis? How many chromosomes are present in each resulting nucleus at the end of meiosis?
beginning: 50; end: 25
Which of the following statements best describes a phase that occurs in meiosis II?
Sister chromatids separate and begin moving to opposite sides of the cell
Crossing over occurs
between chromatids of homologous chromosomes
A researcher examines a cell undergoing meiosis and identifies the nuclei of two daughter cells. What would represent how the researcher would characterize the cell?
two haploid cells in metaphase II
What is the end of meiosis and subsequent fertilization of gametes?
an offspring with a chromosome complement unlike that of either parent
What is true about crossing over?
chromosomes that result from crossing over have a mixture of paternal and maternal alleles
An individual plant that exhibits self-fertilization can produce offspring different from itself primarily as a result of..
independent assortment and crossing over during the the formation of spores
How would you distinguish human mitotic cells from human meiotic cells?
count the number of daughter cells resulting from mitotic and meiotic division
If a fatal disease were to infect an aspen tree that reproduces by cloning, what effect on the aspen grove would be most likely?
The entire grove would die as a result of infection
The cells that produce sperm in humans contain 46 chromosomes. If one of these cells undergoes meiosis to form sperm cells, and chromosomal nondisjunction occurs in Chromosome 22 during meiosis I, what is the chromosome number in each of the resulting sperm?
24; 24; 22; 22
What hypothesis explains why many instances of aneuploidy in humans involve chromosome 21?
it tends to be lethal in embryos if it involves chromosomes with a large number of genes