Answer:
23
Explanation:
46 unreplicated chromosomes- called daughter chromosomes - each one is essentially a chromatid. The parent cell had 46 double chromosomes (2 chromatids each) - which split into two in mitosis. This means that we need to divide 46 by 2 and we get 23.
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Answer:
Hybrid
Explanation:
Two parents belonging to a species and having more than one varying traits are referred to as hybrids. For example –
Let us suppose that two human beings vary in two different traits. One trait is skin color and the other trait is height.
Let the allele for tall height be “T” and the allele for shot height be “t”
Similarly, let the allele for fair color be “F” and the allele for dark color be “f”
Then the genotype of a true-breeding tall and fair person A would be TTFF
And the genotype of a true-breeding short and dark person B would be ttff
Since both the person A and B have two different traits, therefore they can be referred to as dihybrid
Answer:
As many as 30 thousand fur seals become entangled in lost or discarded fishing nets or cargo straps each year.
Explanation:
Human activities cause many damages to marine mammals in general. One of these activities is fishery. The nests are intercepting the migratory routes of animals or are floating free in the sea after being discarded. They are extremely strong, so whenever animals get stuck on them, they might carry them for months or years, affecting their diving, foraging, feeding, and reproductive behavior. These nets might hurt the animals´ skin, producing a wound that will probably get infected.
A few years ago, at least 50,000 northern fur seals died per year after getting stuck in fishing nets. The populations of these animals decreased sharply, affecting their reproductive and growth rates. In the present, due to the decrease in their population size, the number of dead animals is around 30,000 per year. This reduction in death is only because there are much fewer animals every year.
