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alexdok [17]
2 years ago
5

The early ancestors of horses showed the presence of digits on their limbs, while modern horses have hooves. What are likely pos

sible reasons for this change? (more then one answer)
1.asexual reproduction
2.evolution
3.genetic mutations
4.selection
5.willful adaptation to environment
Biology
2 answers:
Zepler [3.9K]2 years ago
7 0

Answer:#2#3#4

Explanation:

klio [65]2 years ago
5 0

The correct answers are evolution, genetic mutation and selection.

The early ancestors of horses showed the pressence of digits and now the modern horses have hooves in their limbs. There could be many reasons for the pressence of hooves horses.

These could be due to the genetic mutations, which could have changed the shape of the digits in the limb. Sudden change in DNA can cause mutation and this mutation can change the phenotype of the horse.

There are chances that evolution took place over a period of time that changed the character in the horse.

Natural selection can also be one of the reason for the change in the phenotype of the digits on the limb of the horses.

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Cinnabar colored eyes (cn) and reduced bristles (rd) are autosomal recessive genes and lobe shaped eyes (L) is an autosomal domi
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Answer:

The correct genotypic notation for a wild type with phenotypic characteristics: red eyes, long bristle and round eyes will be any of CNRDll, CnRdl, CnRDl or CNRdl if c, n, r and d are capable of independent assortment and CNRDl if they cannot.

Explanation:

The eye color and bristle size is coordinated by either recessive cn and dominant CN or Cn genes. The wild type in questions has red color eyes, which is a dominant trait coordinated by CN or Cn if c and n can undergo assortment independently or just CN if they cannot. The second characteristics of the wild type is long bristle. We were told that reduced bristle is coordinated by recessive rd Gene. Then the long bristle in our specimen wild type will have dominant genotypic notification of RD or Rd, depending if r and d can undergo assortment independently. The last trait is a round eyes, which is a recessive trait controlled by recessive allele l. Therefore, the combined characteristics of red eye color, long bristle and round eyes shape of the wild type will be CNRDl or any of CNRDll, CnRdl, CnRDl CNRdl depending on the segregation pattern of c, n, r and d.

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