C) I and III only just got this question on usa test prep and therefore i'm right
See the file I attached for more information
Answer: The image at the top right corner of the page is the answer.
Explanation:
In the food web, arrows are pointed towards the consumer (not otherwise). In essence, two arrows should be pointed towards mouse, since it feeds on both algae and grass. While a single arrow is to be pointed to wolf, since it only feed on mouse.
Thus, the image at the top right corner of the page is the answer.
A sperm and an egg cell are each gametes. They fuse to become a zygote cell which develops into a fetus
Answer:
<em>Some </em><em>cell</em><em>s</em><em> </em><em>don't </em><em>divide </em><em>and </em><em>last </em><em>you </em><em>a </em><em>life </em><em>time </em><em>such </em><em>as </em><em>many </em><em>of </em><em>those </em><em>in </em><em>the </em><em>central </em><em> </em><em>nervous</em><em> </em><em>system </em><em>other </em><em>c</em><em>ells </em><em>such </em><em>as </em><em>stems </em><em>called </em><em>cell </em><em>population</em><em>s</em><em> </em><em>have </em><em>their </em><em>telemeres </em><em>repeatedly</em><em> </em><em>exten</em><em>d</em><em>ed </em><em>by </em><em>the </em><em>enzyme </em><em>telomerase </em><em>other </em><em>cells </em><em>are </em><em>never </em><em>repla</em><em>c</em><em>ed </em><em>and </em><em>live </em><em>as </em><em>long </em><em>as </em><em>we </em><em>do </em><em>.</em>
<em><u>I </u></em><em><u>hope this </u></em><em><u>answer </u></em><em><u>might </u></em><em><u>help</u></em><em><u> </u></em><em><u>u </u></em>
Answer:
C. Fi 1:0, F2 3:1
Explanation:
Firstly, Mendel's law of segregation states that the alleles of a gene will randomly separate into gametes during gamete formation. In this case involving a single trait, hence, a single gene. Mendel crossed two purebreeding plants i.e. homozygous plants that produced different phenotypes for the same gene. He obtained his offsprings which he called F1 offsprings. He realized that all the F1 offsprings expressed only one phenotype. For example, when he crossed homozygous tall (TT) and short (tt) plants, he got F1 offsprings that were all tall.
He then self-crossed these F1 offsprings to produce a F2 offsprings that had a phenotypic ratio of 3:1 i.e. 3tall, 1short plant. He concluded that the alleles of the single gene had segregated into the gametes but one allele was capable of masking the expression of another, as seen in the heterozygous F1 offsprings that were all tall (Tt).
Hence, he obtained a 1:O ratio for his F1 offsprings then a 3:1 ratio for his F2 offsprings.