A veterinarian conducts a study of meiosis in dogs. She observes that during anaphase I, there are 39 pairs of chromosomes being pulled toward opposite ends of the cell. Which of the following statements is false? A. Crossing over has already taken place. B. The diploid number for dogs is 78. C. There will be 39 chromosomes in each dog gamete. D. Each gamete will have two alleles for each gene.

D. Each gamete will have two alleles for each gene.

Explanation:  

Gametes are haploid (n) reproductive cells. In animals, female gametes are known as egg cells, while male gametes are sperm cells. Each gamete (either female gamete or male gamete) contains a complete set of chromosomes which in turn have a complete set of gene variants (i.e., alleles). In consequence, for each gene, the dog's progeny will inherit one allele from the father and one complementary allele from the mother, thereby having a diploid (2n) number of homologous chromosomes.

1. a tropical dry forest carries out more rapid nutrient cycling

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