Answer:
it is a and c
Explanation:
A) evolution by natural selection, sweet peas
B) inheritance by independent assortment, sweet peas
C) evolution by natural selection, Galapagos finches
D) inheritance by independent assortment, Galapagos finches
Correct answer: C). Evolution by natural selection, Galapagos finches
Charles Darwin gave the theory of natural selection in the year 1835 when he visits Galapagos Islands.
There he found several species of finches are adapted to different environmental niches. They have a different shape of the beak, food source they eat and the way they captured the food.
He observes that species vary from island to island, and based on these observations he gave the theory of natural selection.
Answer: The correct answer is second and third statement.
Explanation:
The second and third statement are examples of the concerns expressed by opponents of the use genetically modified food crops. The second statement is related with the fear of the farmers during the harvest stage, because they consider that new genes can reach their crops, from the GM crops. The third statement is related to the fear of the some "naturalists" people who express that the protein products can lead to allergic reactions, however GM food crops have been tested regorously, and there is no evidence of any kind of allergic reaction.
Opponents of genetically modified (GM) food crops express concerns including potential allergic reactions in human consumers, the passing of new genes to wild relatives, and the possible incorporation of these new genes into human consumers' DNA.
Concerns expressed by opponents of the use of genetically modified (GM) food crops include the possibility of GM food crops passing their new genes to human consumers, the potential for GM food crops to pass their new genes to close relatives in nearby wild areas, and the risk that the protein products of transgenes in GM food crops might lead to allergic reactions in human consumers.
GM plants, also known as transgenic plants, are created by inserting DNA from one species into another species to introduce desirable traits. However, the introduction of these foreign genes presents risks including ecological instability due to the potential spread of these genes to other species in the environment. Additionally, the artificial DNA in these foods could potentially trigger allergic reactions in some individuals due to the protein products of these genes.
Further, the concern that GM food crops might pass their new genes to wild relatives stems from the possibility that this could upset the balance of ecosystems and lead to loss of biodiversity. Lastly, the worry that GM food crops might pass their new genes to human consumers may arise from a lack of understanding of the genetic modification process, as genes from food are not typically incorporated into our own DNA during digestion.
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Answer:
An ovary in an angiosperm flower contains one ovule, in which the cells divide to produce an egg and two polar nuclei. These egg and polar nuclei are haploid. The pollen grain introduces sperm cells which are also haploid. The two haploid sperm cells are introduced into the pollen tube and finally reaches to the ovules. The first sperm cell fuses with the egg and zygote form is diploid in ploidy. The second sperm cell will fuse with the two polar nuclei, and a endosperm form is triploid in ploidy.