h) ______________________ The primary tool of naked mole rat queens in suppression of reproduction in other females in the colony.
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Step 1: Understand the social structure of naked mole rat colonies, where typically only one female, the queen, reproduces. Show more…
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Naked mole rat colonies are unusual among vertebrate societies, because a. workers surrender breeding rights without challenge to a few males. b. workers compete for breeding rights. c. workers share breeding rights. d. females select breeding males based on courtship signals.
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A male rat (XY) castrated neonatally would respond to adult estrogen and progesterone injections by showing... Select one: a. female-typical sexual behavior b. both female- and male-typical sexual behavior c. male-typical sexual behavior d. no sexual behavior The formation of testes in a developing vertebrate is determined by... Select one: a. the presence of TDF b. having one X chromosome c. the lack of testosterone d. the presence of MIF e. the presence of testosterone The hormone directly responsible for the secretion of glucocorticoids is... Select one: a. ACTH b. testosterone c. TSP d. CRH e. cortisol Through the process of sexual differentiation, a male rat loses the potential to express his feminine characteristics through a process called ________________. Select one: a. feminization b. masculinization c. demasculinization d. activation e. defeminization Which brain region is responsible for age-related changes in the regulation of the HPA axis: Select one: a. hippocampus b. adrenal gland c. thalamus d. hypothalamus Which hormone is required to stimulate sperm production? Select one: a. LH b. oxytocin c. estrogen d. FSH e. progesterone Which of the following processes is NOT the mechanism by which the typical oral contraception (birth control pill) works? Select one: a. preventing growth of the follicle b. eliminating conception c. eliminating ovulation d. eliminating sex drive e. reducing endometrial elaboration
Dominador T.
Honeybees (Apis mellifera) provide a striking example of environmental effects on eukaryotic gene expression and thus phenotype. Fertile queens and sterile workers are both female bees with the same diploid genomes. However, their morphologies and behaviors are different.It turns out that the diet of the larval (larvae are young developing insects) females controls their development as either workers or queens. When the hive needs new queens, a few female larvae are fed royal jelly, a substance secreted by worker bees, instead of the normal diet of nectar and pollen. Investigators determined that many genes are more highly CpG-methylated in the larval-stage workers than in the larval-stage queens. a. Describe an experiment you could do to determine if DNA methylation correlates with differences in gene expression in workers and queens. b. Researchers were able to mimic the effect of royal jelly by knocking down the expression in female larvae of a DNA methyltransferase enzyme called $D N M T 3$. (The knockdown was accomplished through a technique called $R N A$ interference that is described in a later problem; the details are unimportant here.) Remarkably, when fed a normal diet, most of these larvae developed as queens. Based on the description of the transgenerational silencing of the $A^{Y}$ allele of the mouse agouti gene presented in Fig. 17.24 suggest a simple hypothesis that accounts for the different effects on female honeybee larval development of normal versus royal jelly diets.
Josee P.
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