Answer:
One allele is on one chromosome, and the other is in the same position (locus) on the homologous chromosome.
Explanation:
The genotype of an organism refers to the genetic makeup or complete set of genes. The genes control the trait of an organism and exist in an organism in their alternative form called alleles.
Since the alleles are the alternative form of a gene, therefore, they must be present at the same position called a locus.
These alleles are present on the homologous chromosome in which each homologous chromosome is contributed by each parent.
Therefore when the genotype is aa then a and a allele will be present on homologous chromosomes in the same position.
Thus, the selected option is correct.
Well,
One could add many different prefixes to tropism to get various results.
Photos + tropos = Phototropism = Turning toward the light.
Gravi + tropos = Gravitropism = Turning toward gravity, a.k.a. turning downwards. Plant stems exhibit negative gravitropism, as they grow upwards, against gravity. I would call it "graviphobia."
Hydro + tropos = Hydrotropism = Turning toward water. This is exhibited by plants' roots growing toward water.
Those are the ones that you can look up in a dictionary and find as legit words. These are ones I have just made up, but still make sense (to some degree).
Helio + tropos = Heliotropism = Turning toward the sun. Synonymous with phototropism.
Claudo + tropos = Claustropism = Turning toward enclosed spaces. Sounds silly, but that's what you do to go into an elevator. Synonymous with claustrophilia.
Caput + tropos = Caputropism = Turning toward the head. That's what everyone does when they face the leader of their group.
Astra/stella + tropos = Astrotropism/Stellatropism = Turning toward the star. Basically stargazing.
<span>Condyloid joint
There are 6 types of synovial joints in the human body. For this question, the 2 types that are most likely are condyloid or ball-and-socket joints. Both of these joint types are very similar to each other, so let's look at them in detail to see which one is the correct answer.
Condyloid - Has an ovoid condyle from one bone fitting into an elliptical cavity. It permits movement in two planes, but does not permit rotation.
Ball-and-socket - A ball shaped surface of one bone fits into a cup shaped depression of another. This type of joint permits movement in multiple planes and rotation.
The key difference between these 2 joint types is the symmetry between them. For the ball and socket, the projection is shaped like a ball which is completely symmetrical whereas for the condyloid, the projection is more ellipsoidal or ovoid which prohibits rotation. And since ovoid is mentioned in the question, the best choice would be the condyloid joint.</span>
Answer:
In the course of evolution mammals are the animals which are evolved recently as compared to other groups such as fish, amphibians, or reptiles.
In addition, fur or hairs on body, mammary glands, middle ear bone, warm-blood, et cetera are the characteristics of mammals.
These characteristics were evolved during the course of evolution; they were not present in ancestral organisms.
However, tail, gill pouches, et cetera are characteristics of our ancestral groups. Thus, characters can be sometimes observed in mammals.
But mammals characteristics can not be observed in organisms which were evolved before mammals such as fishes, amphibians, reptiles, et cetera.
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