List the 4 Evidence for Evolution:
2 answers:
Answer:
<u>Evolution:</u> In simple terms is the advancement of the less developed form of life into a more complex form of life, as these organisms go through a series of changes through time,t. As the evolution is resulted from the different changes and improvements been made inside the living organism's body or we can say its over all structure.
<u>For example:</u>
- The coccyx bone or the tail bone is said to be evolved inside the human beings, when the went through a different pathway rather then living like the rest of the primates. So, its now a fused form of bone structure formed after the fusion of three bones present on the lower region of the spinal cord.
- There are number of specie of mammals which has adopted there body to live in the severe conditions, like the climate in the Antarctica. Most of the organisms living there posses an extra covering over there body and makes them able to survive in such cold climates.
- Along, with that there are many microscopic organisms which has arranged there chemical balance in such way that there body is able to coordinate properly inside the harsh conditions and perform a more proper functioning,as they have arrange there cell organelle
- There also some fish specie which has evolved them selves in order to become more versatile in collecting the right amount of nutrients and oxygen from the water molecules.
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Answer: 50% or 25% according to the genotype of the male cat.
Explanation:
The female cat is unaffected, and since this is an autosomal dominant diease, it means this cat does not have any affected alleles. Thereby,<u> its genotype is aa</u>. This is because dominant alleles show their effect even if the organisms only has one copy of the allele. The male cat is affected with this syndrome <u>so its genotype is either AA or Aa</u>. For this disease to manifest itself, only one affected allele is needed. Although both alleles can be affected so the individual can be homozygous dominant or heterozygous.
To find this we have to do a punnett square. Here, we use the gametes produced by each individual. <u>Gametes are sex cells, egg or sperm, which only have one allele of each gene.</u>
Assuming that the cross is between aa and AA, the gametes produced by "aa" are "a", and the gametes produced by "AA" are "A" So we are having a cross between an "a" gamete and a "A" gamete. 100% of the offspring will be Aa so it is a heterozygous, which will develope this syndrome. And, males have one Y chromosome and one X chromosomes, thereby the chances of having a male kitten is 50%. Then, to conclude, there is a 50% chances of having a male kitten with this syndrome.
And, assuming that the cross is between aa and Aa, the gametes produced by "Aa" are "A" but also "a" So we are habing a cross between an "a" gamete and "A" or "a" gamete (See picture) In this example, there is a 50% chances of having a kitten with the syndrome, because only one genotype produced (Aa) has the affected allele. And, as we said before, since there is a 50% chances of having a male kitten, we can said that there is a 25% chances of having an affected male. Because to calculate both probabilities so that they occur simultaneously, it is necessary to multiply them. That is, 0.5 x 0.5 = 0.25 x 100 = 25%.
