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dybincka [34]
3 years ago
15

During an experiment, a scientist crosses a pea plant that has purple flowers with a pea plant that has white flowers. The plant

s that result from this cross in the F1 generation have both purple and white flowers. What can the scientist conclude?
Biology
2 answers:
OleMash [197]3 years ago
5 0

The scientist can conclude that the plants that were used in this experiment contained both a dominant and recessive allele. That the plants were hybrids which causes the off springs to have a 3:1 ratio.

ICE Princess25 [194]3 years ago
4 0

The scientist can conclude that both or one of the pea plant (either white or purple) has or possesses recessive alleles. Also this cross can be possibly between a heterozygous dominant and homozygous recessive pea plant. Suppose the white pea plant is homozygous recessive (ww) and the purple plant is heterozygous dominant (Pw) then the cross between the two would result into  

Pw x ww

Pw, Pw, ww, ww

Thus the offsprings have both purple and white flowers.

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In pea plants, long stems are dominant to short stems, purple flowers are dominant to white, and round peas are dominant to wrin
meriva

Assuming the genes are not linked nor interacting with each other, the expected number of long stemmed plants with purple flowers, producing wrinkled peas, L-P-rr, is 288.

<h3>Available data</h3>

  • long stems are dominant to short stems
  • purple flowers are dominant to white,
  • round peas are dominant to wrinkled

  • Each trait is determined by a single, different gene.

  • A heter0zyg0us plant is self-crossed
  • F1) 2,048 descendants

Let us name te alleles as follows

  • L ⇒ Long stem
  • l ⇒ Short stem
  • P ⇒ Purple flowers
  • p ⇒ white flowers
  • R ⇒ Round peas
  • r ⇒ wrinkled peas

Cross) heter0zyg0us plant is self-crossed

Parental) LlPpRr

Gametes) LPR, LPr, LpR, Lpr, lPR, lPr, lpR, lpr

Assuming that these genes are not linked nor interacting with each other, to make the calcs easier we will make crosses considering each gene separately.

  • Stems

Parental) Ll  x  Ll

F1) 1/4 LL, 2/4 Ll, 1/4 ll

     <u>3/4 long stem,</u> 1/4 short stem

  • Flower color

Parental) Pp  x  Pp

F1) 1/4 PP, 2/4 Pp, 1/4 pp

     <u>3/4 purple flowers</u>, 1/4 white flowers

  • Peas

Parental) Rr  x  Rr

F1) 1/4 RR, 2/4 Rr, 1/4 rr

     3/4 round peas, <u>1/4 wrinkled peas</u>

Now, we will get the proportion of individuals with long stems, purple flowers, producing wrinkled peas, L-P-rr

<u><em>Note</em></u><em>: The symbol - is representing either a dominant or a recessive allele.</em>

From the crosses, we know that

  • 3/4 are long stemmed,
  • 3/4 have purple flowers, and
  • 1/4 have wrinkled peas.

To get the proportion of individuals expressing all these traits together, we just need to multiply these values.

3/4 L- x 3/4 P- x 1/4 rr =<u> 9/64 L-P-rr</u>

Knowing that  the total number of plants is 2,048 and that there are 64 possible gametes combinations from this cross, we will use the proportion 9/64 to get the number of plants with these traits.

64 ------------- 2,048 plants

9 -------------- X = (9 x 2048) / 64 = 288 plants.

<em>We expect to find 288 long stemmed plants with purple flowers, producing wrinkled peas.</em>

<em />

<em />

You will learn more about trihybrid crosses at

brainly.com/question/21942441

brainly.com/question/7333760

brainly.com/question/6764853

4 0
2 years ago
Cellular respiration involves two phases. The anaerobic phase does not involve oxygen, while the aerobic phase does. Where does
Alex

While the majority of anaerobic (without oxygen) and aerobic (with oxygen) respiration occurs in the cytoplasm and mitochondria, respectively, of the cell.

<h3>What is cellular respiration?</h3>

The process through which food, in the form of sugar (glucose), is converted into energy within cells is known as cellular respiration. All kinds of cellular operations are then powered by the energy that is stored in ATP molecules.

There are three types of cellular respiration

1) Anaerobic respiration happens when there is no oxygen present.

2) Aerobic respiration occurs when there is oxygen present.

To know more about cellular respiration, visit:

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3 0
1 year ago
E is a dominant allele for wet earwax and e is a recessive allele for dry earwax. if two individuals with the phenotype of wet e
MrRissso [65]
Given 
E dominant allele for wet
e recessive allele for dry

that means
for phenotype wet, the possible genotypes are EE, or Ee, and
for phenotype dry, the only possible genotype is ee.

Therefore we also know that the child who has dry earwax has genotype ee.
Since the child inherits one allele from each parent, therefore each parent must have a recessive allele "e".

If both parents have phenotype wet earwax, they both must be heterozygous for wet/dry earwax, namely Ee.

8 0
3 years ago
¿Cómo afecta la contaminación del aire generadas por las actividades humanas al sistema respiratorio de los seres vivos?
Zanzabum

Answer:

air pollution can irritate your airways and may cause shortness of breath, coughing, wheezing, asthma episodes and chest pain.

Explanation:

Hope this helps:)

5 0
2 years ago
Why does the energy in sugar need to be converted into ATP
Tema [17]
Because the cells can only use energy in form of ATP.

Its like you can't run a diesel truck on petrol. 
6 0
3 years ago
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