Chapter 3: Problem 20
The period between meiosis I and meiosis II is called interphase II. Does DNA replication take place during interphase II?
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At puberty, the testes contain a finite number of cells and produce an enormous number of sperm cells during the life span of a male. Explain why testes do not run out of spermatogonial cells.
Corn has 10 chromosomes per set, and the sporophyte of the species is diploid. If you performed a karyotype, what is the total number of chromosomes you would expect to see in each of the following types of cells? A. A leaf cell B. The sperm nucleus of a pollen grain C. An endosperm cell after fertilization D. A root cell
The arctic fox has 50 chromosomes (25 per set), and the common red fox has 38 chromosomes ( 19 per set). These species can interbreed to produce viable but infertile offspring. How many chromosomes would the offspring have? What problems do you think may occur during meiosis that would explain the offspring's infertility?
Assuming that such a fly would be viable, what would be the sex of a fruit fly with the following chromosomal composition? A. One \(X\) chromosome and two sets of autosomes B. Two X chromosomes, one \(Y\) chromosome, and two sets of autosomes C. Two \(\mathrm{X}\) chromosomes and four sets of autosomes D. Four \(\mathrm{X}\) chromosomes, two \(\mathrm{Y}\) chromosomes, and four sets of autosomes
Nine-banded armadillos almost always give birth to four offspring that are genetically identical quadruplets. Explain how you think this happens.
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