A European species of marsh grass called Spartina maritima has a diploid number (2n) of 60. A similar species native to North America, S. alterniflora, has 2n = 62
In 1835, the North American species was found growing near the European species in Southampton, England, after being accidentally imported. Occasional sterile hybrids were noted. In 1895 a new species, S. anglica, was first identified at Southampton and subsequently became common. The new species has been identified as a fertile hybrid of the original two species. What is the 2n chromosome number of the hybrids that formed from the original two species S. maritima and S. alterniflora?
A) 153 B) 122 C) 60 D) 61 E) 31
D
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There are no cases of -XX or Y individuals, but X individuals do exist. Propose an explanation for this statistic
What will be an ideal response?
Blood leaving the right ventricle enters the ____________________ circulation. Fill in the blank(s) with the appropriate word(s)
Smoker's cough is the result of
A) carbon monoxide irritation in the throat. B) emphysema. C) dehydration of respiratory passages. D) an accumulation of mucus. E) nicotine exposure.
In your fertility clinic, you look at the lab results of a young man. He has a prostate gland the size of a golf ball, a fructose-rich semen, and 10 million sperm per ml. His sperm consist of little more than DNA, mitochondria, and a flagellum, with almost no cytoplasm. Also, he has follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in his bloodstream. Which of these is the likely cause of his fertility problems?
A. FSH and LH B. Enlarged prostate gland C. Fructose in the semen D. Sperm morphology E. Sperm count