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insens350 [35]
3 years ago
10

In a population of weasels, black (B) and white (W) are co-dominant traits. The heterozygous genotype produces black and white s

potted weasels. Consider the genetic cross shown in Punnett square. If there are 40 baby weasels born as a result of the cross, how many should be black?
Biology
2 answers:
Artyom0805 [142]3 years ago
4 0
The correct answer is C . (10)
Virty [35]3 years ago
4 0

The correct answer is ten.

Codominance is a form of dominance where the alleles of a gene pair are completely expressed in a heterozygous condition.

In a population of weasels, black (B) and white (W) are co-dominant traits and the heterozygous genotype produces black and white spotted weasels. It can be represented by

Parents - Black (BB) x White (WW)

Gamtes - B x W

F1 generation - BW (Black and white spottes weasles)

When, two weasles of F 1 generation (black and white spotted) are crossed with each other, the genotype of the offspring would be one black weasle (BB), two black and white spotted weasles (BW) and one white weasle (WW). If, out of the four weasles produced, one is white, then 10 white weasles are produced out of 40 weasles born.

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Species strategies to survive and successfully reproduce define three basic survivorship curves. <em>The survivorship curve </em><em>type III</em><em> is the one that best represents the Dandelion plants.</em>

------------------------------

According to the species strategies to survive, reproduce, and ensure their reproductive success, we can mention three basic curves,

<u>Type I.</u>

  • Mortality often occurs at the end of the cycle, representing species with low mortality.

  • Organisms exhibiting this type of survivorship curve have long life cycles and high probabilities to survive until they are old enough.

  • These species have few descendants and spend too much time and energy in parental care to ensure their reproductive success.

<u>Type II.</u>

  • The probabilities of dying are equals all along the cycle, at any age interval.

  • The number of dead individuals remains constant from the beginning to the end of the life cycle.

  • These species have reduced offspring, and they ensure their reproductive success by providing some significant parental care.

<u>Type III.</u>

  • Significant mortality during the early stages of life.

  • Only a few individuals reach the later life stages, getting to survive their first period of life. Survivors usually have a long life.

  • These species produce large offspring at the same time, but they provide little or no parental care.

  • The reproductive success of these species depends on the number of descendants and not on the parenting time spent.

According to this information, and the characteristics of the <em>Dandelions, we might assume that this species is represented by type III curve.</em>

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