What is the ratio of phenotypes in the offspring produced by the cross Aa × Aa? Assume complete dominance for the trait
A) 75% dominant:25% recessive
B) 50% dominant:50% recessive
C) 25% dominant:75% recessive
D) 100% dominance
E) 100% recessive
A
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Answer the following statements true (T) or false (F)
1. Malpighian tubules of insects secrete rather than filter to eliminate waste products. 2. The filtrate that leaves the proximal convoluted tubule is much more concentrated than the blood in humans. 3. The blood supply to the loop of Henle also exhibits a countercurrent arrangement. 4. Based on phylogenetic analyses of the mineralcorticoid and glucocorticoid receptors and the presence or absence of their ligands (glucocorticoids and aldosterone) in certain vertebrates, it would appear that hormones always evolve prior to their receptors. 5. It would be reasonable to assume that environmental cues such as photoperiod and temperature might regulate animal reproduction.
Based on the number of species, the most successful extant phylum of plants is the
A. Anthophyta. B. Coniferophyta. C. Pterophyta. D. Gnetophyta. E. Charophyta. F. Hepaticophyta.
Gregor Mendel is known for
A) studying natural selection in the animal life on the Galapagos. B) breeding plants to demonstrate the logic behind inherited trait transmission. C) experiments that demonstrated the direction of blood circulation in the body. D) breeding chickens to reveal the laws of inheritance.
Human infection with Erysipelothrix rhusiopathiae takes a milder form and is known as:
A. Impetigo B. Erysipelas C. Necrotizing fasciitis D. Erysipeloid