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alexandr1967 [171]
3 years ago
13

Describe the selective pressure that drove evolution of skin color.

Biology
1 answer:
I am Lyosha [343]3 years ago
7 0

Answer:

Pigmentation, (skin color), in humans has evolved under selection pressure from the duration and intensity of sunlight. Ancestral populations near the equator were selected for dark skin, while those living in higher northern latitudes were selected for lighter skin.

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Each species has a specific identifying number of chromosomes. For example, a cat, felis catus, has 38 chromosomes, while corn,
tester [92]

Answer:

Each species has a specific identifying number of chromosomes. For example, a cat, <em>Felis catus</em>, has 38 chromosomes, while corn, <em>Zea mays</em>, has 20 chromosomes each chromosome carries specific genes that are unique to that chromosome.

Explanation:

Chromosomes vary in shape and number among living beings. For example, the bacterial chromosome is a unique circular molecule, while human beings have 46 lineal chromosomes arranged in pairs (23 pairs). The total number of chromosomes is specific to each species, and it is denoted as the "chromosomic dotation" of the species.

Genes are the hereditable units that transmit the information needed to specify traits, from parents to offspring, generation to generation. Genes are arranged in sequence in the chromosomes. A chromosome might contain hundreds of thousands of genes.

Genes vary in size and shape.  They are composed of pairs of bases, and these sequences also vary in number, producing genes of different lengths. In general, genes code for proteins. Proteins create the organism tissues and perform or carry out specific functions in the organisms, controlling almost all processes and chemical reactions.

Each chromosome carries <u>specific</u> genes that code for <u>specific </u>proteins that have <u>specific</u> functions in the organisms. Each chromosome carries information to synthesize different proteins needed to accomplish a certain function. But <u>not all chromosomes carry the same gene sequences</u>. Only homologous chromosomes carry information for the same trait, but even this information is not necessarily the same. They might have the same gene but different alleles.

4 0
3 years ago
Which of the following is the most likely way that two water molecules will interact? Choose 1 answer: Choose 1 answer: (Choice
grin007 [14]

Answer:

D. Two water molecules connected by an O-H interaction

Explanation:

Oxygen has a slight negative charge and hydrogen has slight positive charge. This creates an attraction between the two atoms which helps them bond.

3 0
2 years ago
The four main types of pest
-Dominant- [34]

Answer:

1) Insect

2) Mites

3) Rodents

4) Animals

5) Birds

Explanation:

1)  These are significant and significant pests. Insects have three pairs of legs, two pairs of wings, a segmented body, and complex eyes and antennae that are unique to them. Insects are smart, extracting sap from plants, biting plant parts, burrowing into fruits, twigs, and leaves, attacking roots, barks, and blooms, among other things. Larvae, adults, and nymphs are the stages of insect pests that cause harm.

2) These are insect-like organisms with a soft body and four pairs of legs. The colour of these small organisms is red or pastel yellow. They feed on the plant's sap and attack the crops in large numbers.

3) This bug consumes a considerable amount of human food and causes widespread crop damage. They're also to blame for massive grain losses on fields, in warehouses, and in homes.

4) Wild boars, deer, elephants, buffalo, jackals, monkeys, and squirrels are among the animals that inflict direct harm to agricultural plants. They devour the plants and, as a result, squander a tremendous amount of food.

5) Birds devour grains and destroy crop plants. Crows, parrots, and sparrows are among the most common birds that prey on crops.

(Hope this helps can I pls have brainlist (crown)☺️)

4 0
2 years ago
There are many many stars in the universe in which of the following do all stars appear to be quite similar A. chemical composit
Alex Ar [27]

Answer:Chemical Composition

Explanation:

none of the others make even the simplest of sense.

5 0
3 years ago
the liver does not divide jobs up among the lobes (if it did, each lobe would be a separate organ) why, then, divide the mass of
pychu [463]
She does her homwork
5 0
3 years ago
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