Help please! Describe the process of natural selection and how it affects hummingbird populations.

Biology

1 answer:

Kipish [7]3 years ago

4 0

Natural selection has 4 processes.

Individuals looks different and have different characteristics from another within their own species (genetic variation). Some characteristics suits better for the environment, which has to be passed on from one generation to the next. The humming birds with long bills will mate with those that have that too so they'll produce offspring with long bills.

The second process is over production of offspring. The humming birds produces lots of offspring but only a few survives.

Another factor of natural selection is struggle for existence, which leads to differential survival and reproduction. There are environmental pressures, like not having enough space or food, for example, humming birds compete fiercely for resources like nectar. Natural selection will favor individuals that are more efficient at getting nectar and natural selection will result in changes in wing shape which can allow them to fly longer distance and affect the length and shape of bill for them to drink nectar. Little changes may affect how well they feed and survive. Those who are the fittest survives and are most likely to reproduce and pass on their advantageous genes to their offspring. If the long bills are more advantageous and can survive better in a particular environment, then overtime, those with short bills will disappear because they can't survive and the entire population would have long bills.

You might be interested in

ASAP plz Can someone help me with biology and give me the correct answers?

Leokris [45]

Answer:

carbon dioxide, Photosynthesis. Animals, plants, Oxygen, respiration. Decompose, combustion

Explanation:

Fill the blanks with those answers in that order

6 0

3 years ago

Mendel crossed yellow-seeded and green-seeded pea plants and then allowed the offspring to self-pollinate to produce an F2 gener

pashok25 [27]

Answer:

C. The green allele is recessive to the yellow allele

Explanation:

Complete dominance occurs when one gene variant or allele referred to as the 'dominant allele' completely masks the expression of another allele referred to as the 'recessive allele' in heterozygous individuals, i.e., in individuals carrying one copy of the dominant allele and one copy of the recessive allele for a particular locus/gene (whereas homo-zygous individuals carry the same alleles for a given locus/gene). Mendel crossed pure lines of pea plants, i.e., homo-zygous lines for different traits such as seed color (yellow and green) and seed shape (round and wrinkled). In this case, the parental cross was YY x yy, where the 'Y' allele is dominant and encodes for yellow seed color, and the 'y' allele is recessive and encodes for green seed color. From this cross, Mendel obtained a hybrid F1 (i.e., all progeny was heterozygous with genotype Yy). An expected 3:1 ratio as observed in this case (6,022 yellow and 2,001 green seed >> 3:1 ratio) is characteristic of the progeny that results from mating between F1 heterozygous parents, where each parent has one dominant allele and one recessive allele, i.e., F1 parental cross: Yy x Yy >> F2: 1/4 YY (yellow color); 1/2 Yy (yellow color); 1/4 (green color) >> 3:1 ratio of yellow to green seeds.

4 0

3 years ago

Why might variation in guppy coloration have developed as a trait?

solniwko [45]

From it's environment and from traits from other parents.

4 0

3 years ago

Color blindness is a recessive trait on the X chromosome. What are the genotype and phenotype ratios of a cross between a normal

NikAS [45]

if we cross XNXN(normal, non-carrier female) with XnY(color-blind male)

we get XNXn XNY XNXn and XNY

genotype ratio: XNXn:2 XNY:2

phenotype ratio:2 carrier females and 2 healthy males

8 0

3 years ago

As a result of chronic stress associated with an intense high school weight-lifting program, a 15-year-old boy suffers an avulsi

tigry1 [53]

Answer:

The correct answer is: supraspinatus.

Explanation:

Many muscles insert in the humerus - in its greater tubercle, where the fracture took place, is where three of the four rotator cuff muscles insert: supraspinatus, infraspinatus, and teres minor. Avulsion of the greater tubercle could result in detachment of any of these 3 muscles but if we take into account that the 15-year-old boy had difficulty initiating abduction of the upper limb, we can infer that the damaged muscle is the supraspinatus because its main action is to start the abduction the upper limb.

5 0

3 years ago