Charles and Mary Brown have demonstrated that as colony size increases for cliff swallows, the number of nests with one or more unhatched eggs decreases
They have also demonstrated that as the size of colony increases, the number of parasites increases, and these parasites directly cause nest failures and juvenile mortality. These two observations indicate that there are trade-offs in group living. What would be a better measure than unhatched eggs to understand the benefits of group living in cliff swallows?
What will be an ideal response?
ANS:
Measuring overall nest success in relationship to colony size would indicate if there is an overall benefit of group living because it would take into account the mortality costs imposed by the parasites.
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Which of the following is part of the process of X chromosome inactivation?
A. Expression of Xist from both chromosomes at the start of the process B. Binding of multiple Xist transcripts to Xic on the X chromosome that will be inactivated C. Compaction of the active X chromosme into a Barr body D. Binding of Tsix transcripts to the X chromosome to be inactivated after the Xist transcripts binds to Xic
What are the numbered structures shown in this diagram?
a. glycocalyx
b. phospholipids
c. integrins
d. cholesterol
Each human ?-globin locus contains two ?-globin genes, ?1 and ?2, and most individuals have two copies of the locus. Which of the genotypes would result in the most severe phenotype? (A"–" represents a deletion allele.)
A) ?1 ?1 / ?2 ?2 B) ?1 – / ?2 – C) ?1 ?1 / – – D) ?1– / ?2 ?2 E) ?1 – / – –
The so-called robust australopithecines are:a
the earliest members of the genus Australopithecus. b. the line that gave rise to the genus Homo. c. the hominids that developed from Ardipithecus. d. a dead-end branch in hominid evolution. e. an extinct line of hominoids that existed about 6?7 million years ago.