Propose an experiment and suggest a control treatment for each of the following questions. Do bearded dragons that are genetically male chnage into females if eggs are incubated at temperatures above 32 C?
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Propose an experiment and suggest a control treatment for each of the following questions.
Do bearded dragons that are genetically male chnage into females if eggs are incubated at temperatures above 32 C?
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- Give a brief analysis on emergence success from the following chi-square data?The slow block to polyspermy involves a permanent modification of the egg surface, usually through exocytosis of the cortical granules. In the 1970s, Dave Epel carried out experiments that led to the conclusion that a Ca2+ rise in the egg is both necessary and sufficient to trigger cortical granule exoctyosis (CGE). For the experiment below, describe it as correlation, loss-of-function or gain-of function. Then, indicate the predicted result. Experiment (a) – Dr. Epel injects the egg with an indicator dye that fluoresces when Ca2+ binds to it. In unfertilized eggs, there is no fluorescence and no CGE. However, when sperm are added to the eggs, he observes fluorescence and then CGE.O potassium ions O sodium ions Question 18 In sea urchins, which of the following pairs of events most directly results in the short-lasting "fast block" and the longer-lasting "slow block" to polyspermy, respectively? O formation of the jelly coat and the vitellin membranes O the cortical reaction and the formation of yolk protein O the acrosomal reaction and vitellogenesis O membrane depolarization and the cortical reaction Question 19 Which of the following correctly describes a difference between the vegetal pole of a frog zygote and the animal pole? O The blastomeres originate only in the vegetal pole. O The vegetal pole has a higher concentration of yolk. O The polar bodies bud from this region. The vegetal pole cells undergo mitosis, but not cytokinesis. 1
- Describe the evidence that the development of queen honeybees is due to exposure to royal jelly.Consider the temperature effect in the sex determination of a turtle species represented in the graph below. 100 What effect would a decrease in temperature below the epivotal temperature have on sex ratios of these turtles? 50 FT MT Temperature Fewer males and females will result. None of the other answers is correct. No difference in the proportion of females to males will result as only colder temperatures will alter the sex ratio in the offspring. More males than females will result. More females than males will result. To Percent female O O O OPart A Consider the temperature effect in the sex determination of a turtle species represented in the graph below. 100 What effect would a decrease in temperature below the epivotal temperature have on sex ratios of these turtles? 50 Тр Temperature FT MT No difference in the proportion of females to males will result as only colder temperatures will alter the sex ratio in the offspring. None of the other answers is correct. Fewer males and females will result. O More males than females will result. More females than males will result. Percent female
- Clownfish are protandrous hermaphrodites. Determine whether the following features are encoded by the clownfish genome or are influenced by the proteome in response to the environment. The juvenile clownfish has both male and female immature reproductive organs. Clownfish are able to produce both testosterone and 17-estradiol. Genome encoded Increased estradiol levels lead to increased levels of proteins that promote the growth of female sex organs. Increased testosterone levels lead to increased - levels of proteins that cause male sex organs to develop Proteome influencedEgg laying in fruit flies can be triggered (induced) when males transfer their sperm to females. Which of the following is a selective advantage of induced egg laying for the male flies? Less time and energy is expended by the male. The males do not have to produce as much sperm. More eggs can be fertilized. A male fly's sperm is more likely to be used for fertilization. Submit Request AnswerThe pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes?* nd 2 chool The proportion of DDT-resistant mosquitoes in a population remains constant due to O the metabolic costs of DDT utilization DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT. A population of 1.492 finches is intróduced to a rainforest. Over the next year, the finches show a death rate of…
- Describe what sexual dimorphism is and why its existence is puzzling.To conduct their experiment, the researchers collected L. peronii eggs from a natural stream. After the eggs had hatched, tadpoles were raised in artificially constructed 2 L containers in a laboratory. All containers were filled with 1 L of filtered tap water, and the water was changed every other day. Thirteen tadpoles were placed in each container, and the tadpoles were exposed to a 12-hour light: 12-hour dark photoperiod. All tadpoles were fed thawed spinach daily. The researchers randomly placed the tadpoles into containers exposed to one of four treatments, with nine replicates of each treatment, as follows: Low UVBR (<6.0 kJ/m2), low temperature (15OC) Low UVBR (<6.0 kJ/m2), high temperature (26OC) High UVBR (>70.0 kJ/m2), low temperature (15OC) High UVBR (>70.0 kJ/m2), high temperature (26OC) The researchers recorded the number of tadpoles still alive out of the original 13 in a container (percent survival) at different time periods. Their results at Week 4,…Describe an example of each of the following: a pre-zygotic barrier to reproduction a post-zygotic barrier to reproduction
