Scientists find evidence that the genes involved in tooth development exist in chickens, even though chickens do not normally de
velop teeth. The formation of teeth in chickens can be controlled by introducing a virus into chicken embryos that "turned on" their tooth-developing gene. They find that the beaks of the virus-modified chicken embryos contain cone-shaped teeth similar to embryonic crocodile teeth. Which of the following best describes the conclusion that can be drawn from this experiment? (1 point) As bird evolution continues, birds like chickens will develop teeth like dinosaurs and reptiles.
The growth of teeth in chickens supports the hypothesis of a common ancestor between birds and reptiles.
The chickens with teeth are more closely related to crocodiles than they are to regular toothless chickens.
With enough genetic engineering, chicken embryos can develop into reptiles like crocodiles.
The correct answer is B. The growth of teeth in chickens supports the hypothesis of a common ancestor between birds and reptiles.
Explanation:
In biology, genes are not only related to the features organisms show but also provide information about the origin of the organism as well as whether organisms are related. In this way, in the case presented the formation of teeth in chickens (Birds) and the similarity of these to the ones of crocodiles (reptiles) supports the widely accepted hypothesis that both types of animals have a common origin or ancestors as it is believed they both evolved from dinosaurs but in the case of chickens or birds certain genes or features have become permanently recessive which means they are still part of the genetic information but are not expressed anymore. Also, this does not imply birds will become reptiles or dinosaurs. Considering this, the conclusion that can be drawn from this experiment is that the growth of teeth in chickens supports the hypothesis of a common ancestor between birds and reptiles.
Behavioural Adaptation: A Red Belly Black Snakes is able to find small positions to get away from predators, as they have adapted to hide in small cracks, holes and logs as this enables the snake to get away from predators.
A patient will be at increased risk of postpartum bleeding or hemorrhage if the baby she gives birth to is very big. The time spent in labour is also important. If the woman labor for a long time before giving birth, she may have increased risk of postpartum bleeding.
