A liger is a result from a male lion and a female tiger. Male ligers are usually sterile. This is an example of
A. a prezygotic mechanism.
B. hybrid inviability.
C. hybrid sterility.
D. hybrid breakdown.
E. a prezygotic mechanism and hybrid sterility are correct.
C. hybrid sterility.
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As the result of exposure to a mutagen, cytosine is substituted for thymine in one strand of DNA. Upon subsequent DNA replication, one of the daughter cells will have a GC pair in this position instead of an AT pair. This is called a(n) ________ mutation.
A. insertion B. transition C. frameshift D. transversion
Choose the true statements about the initiation of limb development in tetrapods.
_____ Forelimbs in birds and humans are analogous structures. _____ The development of homologous limbs in different species involves the activation of all the same genes. _____ Like Brachyury, Tbx5 has a T-box domain that codes for a transcription factor. _____ Tbx5 encoded protein turns on genes that initiate limb development.
The total collection of alleles in a population at any one time makes up that population's ________.
A. heterozygote frequency B. gene pool C. allele frequency D. genotype
Giovanni is resting peacefully after a long day of hard work. Assuming he is otherwise healthy, what would be the volume of his ventilations?
A) 1100 to 1200 ml B) 1900 to 3300 ml C) 500 ml D) 4500 to 6000 ml