In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons
What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female? A) 2:1 male to female
B) 1:2 male to female
C) 1:1 male to female
D) 3:1 male to female
A
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Habituation is a form of learning in which the subject:
a. continuously produces a certain kind of behavior in the presence of sign stimulus b. fails to make a response when the sign stimulus is presented for the first time c. produces fewer responses to a stimulus that is repeated several times in succession. d. strongly reacts to a stimulus when it is presented after a long period of time has passed
Parathion is effective and highly toxic to only about 5% of the human population
a. True b. False
The movement of large molecules or large quantities of molecules into a cell is accomplished through ________; movement of these molecules out of the cell is accomplished through ________
Fill in the blank(s) with correct word
The driving force behind the evolution of the human mind has been primarily due to pressures stemming from
A. navigating a larger territory. B. interacting with other minds. C. tracking resources scattered across space and time. D. the last Ice Age.