Answer: scientists collected fossils that showed species changing over time
Darwin collected specimens from around the world during the HMS Beagle voyage
Darwin proposed the theory of evolution by natural selection
Mendel proposed laws for how traits are inherited
Scientist examine evolutionary relationships using DNA sequencing
Explanation:
Answer:
11) False
Explanation:
Not all non-native species are invasive. For example, most of the food crops grown in the United States, including popular varieties of wheat, tomatoes, and rice, are not native to the region. To be invasive, a species must adapt to the new area easily. Invasive species are those introduced species that spread widely or quickly and cause harm, be that to the environment, human health, other valued resources, or the economy.
in the Rocky Mountains
under the Missouri River
inside the Grand Canyon
The thickest part of the earth’s crust is under mountains. Whenever there is a volcanic eruption, more material is poured out on the earth’s surface from under the crust, so as the years pass the earth’s crust is increasing slowly.
The area of Rocky Mountains is where the earth’s crust would be expected to be thickest.
Answer: In the Rocky Mountains.
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Ans.
The dominant allele can be defined as the allele, which can express itself in both heterozygous and homozygous conditions. On the other hand, recessive allele can only express itself in homozygous condition (when both the alleles for recessive traits are present. It means presence of one dominant allele can hide the expression of recessive allele.
In given experimental flower, red color is dominant over white color of flower. So, 'if a plant grower wants to produce red flowers only, he should choose both the parent plants having red flowers as they have at least one allele for red color that would transfer to their offspring.'
Lets understand this in a calculative way,
Let the parents genotype be RR and Rr
The offspring’s produced are – RR, Rr, Rr, RR, Thus all the offsprings are white as r is recessive, for producing a red flower the offspring must have “rr” genotype.
Now if parents have Rr and rr genotype , then the offspring would have Rr, rr, rr, Rr giving two white and two red flower. Of the second case may be where both the parent white flower are the carrier with genotype “Rr”
Thus in order to produce red flower the parents with following genotypes is necessary –
a) Both parents having Rr
b) One parents with rr and the other parent with Rr genotype