Which of the following is true about genes?
1.Genes are responsible for all the traits of an organism.
2.In humans, genes are passed to an offspring from two parents.****
3.Genes are made up of smaller molecules known as chromosomes.
4.The genes of a particular organism can never change throughout its lifetime.
2. In humans, genes are passed to an offspring from two parents.
Sexual reproduction produces offspring that are genetically _______ to the parents.
identical
unrelated
similar
opposite
Similar.
Relationships between organisms may be beneficial or detrimental. Which of the following examples shows a relationship in which both organisms benefit?
A tick attaches itself to the skin of a dog and takes a blood meal.
A female black widow spider Latrodectus mactans mates with a male spider; then, she consumes him.
An African wasp Certolsolen arabicus pollinates a fig tree Ficus sycomorus as it eats the tree's nectar.
A species of hyena known as the aardwolf consumes termites for nourishment.
An African wasp Certolsolen arabicus pollinates a fig tree Ficus sycomorus as it eats the tree's nectar.
u sure?
Yes, I am sure. The relationship between the African wasp and the fig tree is an example of mutualism, where both organisms benefit. The wasp gets food (nectar) from the tree, and in return, it fertilizes the tree's flowers, allowing the tree to reproduce.
Both of Tim's parents have brown eyes, but Tim has blue eyes. How is this possible?
The characteristic (blue eyes) is carried in a recessive gene.
This characteristic (blue eyes) must be carried in the dominant gene.
Eye color is not a genetic trait.
all of these
The characteristic (blue eyes) is carried in a recessive gene.
sure??
Yes, I am sure. The inheritance of eye color is determined by multiple genes, including both dominant and recessive alleles. Blue eyes are a recessive trait, which means that both parents must carry a copy of the recessive allele for their child to have blue eyes. Since both of Tim's parents have brown eyes, they could each carry a recessive gene for blue eyes and pass it on to their child. Therefore, it is possible for Tim to have blue eyes even though both of his parents have brown eyes.
The image below shows an aquatic food web. Which of the following describes how energy is transferred between the algae and the crustacean?
The algae and the crustacean both transfer energy to each other.
Energy is transferred from the crustacean to the algae.
Energy is transferred from the algae to the crustacean.
Energy is not transferred between the algae and the crustacean.
Energy is transferred from the algae to the crustacean.
A widow's peak is a V-shaped area of the hairline in the center of the forehead. The allele for having a widow's peak is dominant to the allele for not having a widow's peak. If two parents do not have widow's peaks, what is the probability that their child will have a widow's peak?
75%
50%
25%
0
The probability that their child will have a widow's peak is 50%.
This is because both parents do not have widow's peaks, which means that they both have the recessive allele for not having a widow's peak (represented as "ww").
Since the allele for having a widow's peak is dominant (represented as "W"), the only way for their child to have a widow's peak is if they inherit one dominant "W" allele from one parent and one recessive "w" allele from the other parent, which can be represented as "Ww".
When you cross two parents who are both "ww" (not having a widow's peak), the possible genotypes for their offspring are "ww" and "Ww", meaning that half of their children will have the genotype "Ww" and will have a widow's peak (since "W" is dominant).
Therefore, the probability that their child will have a widow's peak is 50%.
u sure bot?
Yes, as an AI language model, I am sure that the probability that their child will have a widow's peak is 50%. This is a classic example of a single gene trait with complete dominance and simple inheritance.
The Canadian lynx is a large wild cat that lives in the cold regions of Canada. The snowshoe hare is the main prey species that is hunted by the Canadian lynx. The snowshoe hare eats grass, fern, and leaves.If the population of Canadian lynx were to completely disappear, what would most likely happen to the food supply of the snowshoe hare?
The population of snowshoe hare would decrease, and there would be more food available.
The snowshoe hare would stop eating grass, so there would be less food available.
The snowshoe hare would start eating each other, so the food supply would not be affected.
The population of snowshoe hare would outgrow the food supply, so there would be less food available.
If the population of Canadian lynx were to completely disappear, the population of snowshoe hare would likely increase, and as a result, the food supply for the hare could become limited which would lead to a decrease in the population of the snowshoe hare. This is because without the lynx preying on them, there would be less pressure on the hare population, allowing it to grow larger. As a result, the population of hares could outstrip the food supply, leading to a decline in population due to competition and food shortage.
whats the answer
The population of snowshoe hare would outgrow the food supply, so there would be less food available.
Many animals, including the brittle star and snapping shrimp, make their homes inside sea sponges. Here, the animals not only find safe shelter, but also have a constant flow of well-oxygenated water, and may even eat the substance produced by the sponges. The sponges are not affected in any way by the presence of these animals. Which type of relationship does this represent?
parasitism
predator/prey
mutualism
commensalism
This represents a Commensalism relationship.
There are approximately 200 species of mice that live all over the world. Deer mice are a particular species of mice that prefer to live in forests, prairies, and fields. It has been observed that deer mice that live in trees tend to have longer tails because they use their tails for balance. Deer mice that live in prairies and fields tend to have shorter tails so they are less likely to be caught when running away from predators. If a forest fire occurred in an ecosystem eliminating the majority of the trees and short-tailed mice are naturally selected over long-tailed mice, the evolution of the mice can be primarily attributed to
Captionless Image
genetic engineering.
selective breeding.
environmental factors.
human impact.
The evolution of the mice can primarily be attributed to environmental factors. In this case, a forest fire has disrupted the natural habitat of the deer mice, and the shorter-tailed mice have a better chance of survival and passing on their genes to the next generation. The trait for shorter tails is then selected for by the environment, and over time, the population of deer mice in the area may shift towards having more individuals with shorter tails. This is an example of natural selection, which is a driving force of evolution.
answer?
The evolution of the mice can primarily be attributed to environmental factors.
Look at the food web shown below. Which organisms get energy from producers?
Captionless Image
squid
zooplankton
sperm whales
phytoplankton
Zooplankton, squid, and sperm whales get energy from producers as they consume phytoplankton, which are producers.
Which of the following is a producer in the food web shown below?
ant
tadpole
sunlight
grass
bot
Grass is a producer in the given food web. It can convert sunlight into chemical energy through the process of photosynthesis and produces its own food.
Some people have attached ear lobes and some people have free ear lobes. The differences in these traits are caused by
differences in environment.
differences in personality.
differences in diet.
differences in genes.
The differences in ear lobe traits (attached or free) are caused by differences in genes. In this case, the gene(s) responsible for determining whether a person has attached or free ear lobes is inherited from their parents and passed down through the generations. The attachment of ear lobes is a dominant trait, controlled by one gene that determines the shape of the ear lobe. Therefore, if a person inherits even one copy of the dominant gene for attached ear lobes from either parent, they will have attached ear lobes. If they inherit two copies of the recessive gene for free ear lobes, they will have free ear lobes.
Diagram 1 shows the fossilized remains of the lower portion of a camel's leg. Each subsequent diagram shows the same portion of a camel's leg, but the diagrams are from progressively later time periods. Diagram 4 shows the most recent fossil.
how fossil evidence cannot be used to support evolution.
that all living organisms have increased in size over time.
how fossil evidence can be used to show the evolution of a species over time.
that modern camels have more toes than earlier species of camels.
Fossil evidence can be used to show the evolution of a species over time.
The diagrams show the progressive changes in the structure of the camel's leg over time, which is evidence for the gradual evolution of camels. This type of evidence is useful in building a timeline of the changes that have occurred in a particular species over time. It also allows scientists to make comparisons between different species, and to identify patterns of gradual change that may indicate evolutionary relationships.
The other answer choices are not correct. Fossil evidence can be used to support evolution and its mechanisms, such as natural selection and genetic drift. The size of organisms increasing over time is not a universal trend, and it is not supported by fossil evidence. Finally, the number of toes in different species of camels could be used as fossil evidence of the evolution of camels, but there is no indication that modern camels have more toes than earlier species of camels.