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Snowcat [4.5K]
3 years ago
8

Consider the group of giraffes in the image below. Which statement about the giraffes explains their evolution based on Charles

Darwin’s main points? The closest fossil ancestor to these giraffes would have a very short neck. All three of the giraffes have an equal chance of reproducing regardless of the environment. As a giraffe reached for food, the giraffe could make its neck longer making it better adapted to the environment. Long necks were a random genetic change and resulted in the gradual increase of organisms with long necks.
Biology
2 answers:
Lilit [14]3 years ago
5 0

Answer:

Long necks were a random genetic change and resulted in the gradual  increase of organisms with long necks.  

wlad13 [49]3 years ago
4 0

Answer:

D.) Long necks were a random genetic change and resulted in the gradual increase of organisms with long necks.  

Explanation:

Hope this helps....!

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A new human species was found on a distant planet, whose genetic inheritance and process of reproduction is identical to that of
Vedmedyk [2.9K]

Answer:

  1. E/e ; T/t  ⇒ Square eyes and long tail (Option D)
  2. 3/16 will have round eyes and long tails (Option C)
  3. 1/4 of the progeny will be heterozygous for both traits (Option A)

Explanation:

<u>Available data</u>:

  • Two diallelic unlinked genes
  • Gene E controls eye shape: Dominant allele E expresses square eyes, and recessive allele e expresses round eyes.
  • Gene T controls the tail size. Dominant allele T expresses long trail, and recessive allele t expresses short tail.

<u>Genotypes                                          Phenotypes</u>

EETT, EeTT, EETt, EeTt                     Square eyes and Long tail

eeTT, eeTt                                          Round eyes and Long tail

EEtt, Eett                                             Square eyes and Short tail

eett                                                      Rounf eyes and short tail.

<em>1. An individual of this new species is heterozygous for gene E and heterozygous for gene T. What is their genotype and phenotype?</em>

The heterozygous individual is E/e ; T/t, expressing square eyes and a long tail.

<em>2. Two individuals, who are both heterozygous for eye shape and tail size, mate. Which of the following is a correct statement about the phenotype ratios expected for their offspring?</em>

Cross: between two heterozygous individuals

Parentals) EeTt    x     EeTt

Gametes) ET, Et, eT, et

                ET, Et, eT, et

Punnett square)  .   ET        Et        eT       et

                  ET     EETT    EETt    EeTT    EeTt

                  Et      EETt     EEtt     EeTt      Eett

                  eT    EeTT    EeTt    eeTT     eeTt

                   et     EeTt      Eett     eeTt      eett

F1) Genotype:

  • 1/16 EETT
  • 2/16 EETt
  • 1/16 EEtt
  • 2/16 EeTT
  • 4/16 EeTt ⇒ 1/4 EeTt
  • 2/16 Eett
  • 1/16 eeTT
  • 2/16 eeTt
  • 1/16 eett

      Phenotype

  • 9/16 E-T-, Square eyes and Long tails
  • 3/16 E-tt, Square eyes and short tails
  • 3/16 eeT-, Round eyes and Long tails
  • 1/16 eett, round eyes and short tail

Phenotypic ratio 9:3:3:1

<em>3. From the mating described in question ABOVE, what proportion of ALL of the offspring in will be heterozygous for both traits?</em>

4/16 = 1/4 = 25% of the progeny are expected to be heterozygous for both traits, EeTt.

7 0
3 years ago
How would asthma effect the respiration?
Mumz [18]
Asthma is due to spasms in the bronchi of the lungs making the task of breathing require more effort.
8 0
3 years ago
According to Lamarck, the
Angelina_Jolie [31]

Answer:

According to Lamarck, organisms altered their behavior in response to environmental change. ... Their changed behavior, in turn, modified their organs, and their offspring inherited those "improved" structures.

8 0
2 years ago
HALITOSIS IS ANOTHER WORD FOR DENTAL DECAY
Radda [10]
Nope it is not look it up on the Internet
6 0
3 years ago
A selectively permeable membrane separates two solutions. Water is able to pass through this membrane; however, sucrose (a disac
NNADVOKAT [17]

Answer:

a. Nothing happens because the two solutions are isotonic to one another.

Explanation:

Two solutions of the same molarity are separated from each other by a membrane that allows water molecules but not the glucose or sucrose to move across it. Movement of water across the selectively permeable membrane occurs only when two solutions have different concentrations of solutes. In that case, water moves from a hypotonic solution towards a hypertonic solution. Since both sucrose and glucose solutions have the same tonicity, there would not be any change in the solution.

3 0
3 years ago
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