1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vaieri [72.5K]
3 years ago
7

Two independently segregating genes determine kernel color in wheat. Red color results from at least one dominant allele in both

genes. Kernels on rrbb plants are white, and the lack of a dominant allele in either the R locus or the B locus (but not both) results in brown kernel color. If you mate a plant that is true-breeding for red color kernels with a plant that is true-breeding for white color kernels:a.What is the expected phenotype of the F1 plants?b. What are the expected phenotypic classes in the F2 progeny and their relative proportions?
Biology
1 answer:
Lera25 [3.4K]3 years ago
7 0

Answer:

a) The expected phenotype of the F1 plants is 100% RrBb, red kernels.

b) The expected phenotypic classes in the F2 are: 9:3:3:1

   9/16 R-B-, 3/16 rrB-, 3/16 R-bb,  1/16 rrbb

   Proportions 9:6:1.

9/16 Red kernel (R-B-), 6/16 Brown kernel (rrB- + R-bb), 1/16 White kernel (rrbb)    

Explanation:

<u>Available data:</u>

  • red kernel: R-B-
  • brown kernel: R-bb or rrB-
  • white kernel: rrbb

1º Cross)  RRBB      x      rrbb

F1)             100% RrBb (red kernels)

2ºCross)   RrBb       x       RrBb

Gametes)  RB                   RB

                  Rb                   Rb

                  rB                    rB

                  rb                    rb

Punnet Square)      RB           Rb         rB         rb

                 RB      RRBB      RRBb     RrBB     RrBb

                 Rb      RRBb      RRbb     RrBB     Rrbb

                 rB       RrBB       RrBb      rrBB      rrBb

                 rb       RrBb       Rrbb       rrBb     rrbb

F2)  Phenotypic classes:

       <em>9/16 R-B-</em>

<em>        3/16 rrB-</em>

<em>        3/16 R-bb</em>

<em>        1/16 rrbb</em>

      Phenotypic proportions:

      <em>9/16 Red kernel (R-B-)</em>

<em>       6/16 Brown kernel (rrB- + R-bb)</em>

<em>       1/16 White kernel (rrbb)         </em>                      

You might be interested in
Pls help with these three questions
Mariulka [41]
9. Normal tides would remain the same but neap and spring tide cycle would be cut in half. Meaning if there was a neap tide after every 14 days it would come 2 times faster (after every 7 days)
4 0
3 years ago
Should i pick for cinderella or little red riding hood in into the woods
jonny [76]
You should pick Cinderella
5 0
3 years ago
Short definition of amoeba​
Dimas [21]
Amoeba: Also ameba. A single-celled (protozoan) organism that constantly changes shape. The word "ameba" is from the Greek "amoibe" meaning "change." Ameba can infect the bowels to cause diarrhea and the liver to cause abscess formation. Here is more information. The definition of an amoeba is a one-celled organism, common in water and soil, possessing no set cell organs, structure, or defining shape. An example of an amoeba is an invisible organism called Entamueba histolytica which is found in tropical areas that are unclean, and causes the deadly disease dysentery. Hope this helps! Mark brainly please!
4 0
3 years ago
A DNA strand has mutated! What type of mutation has occured?
velikii [3]

Answer:

b

Explanation:

6 0
3 years ago
Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. this ratio suggests that _____.
Lemur [1.5K]
Offspring   with  a  3:1  ratio  suggest  that  both  parent  that   both  parent  that   give  rise   to  this  offspring  were  both   heterozygous.  Heterozygous  individual   is   someone  who  has  two  different  allele  at  a  locus whereby  by  one  gene  is   dominant   over  the  other  gene.  example  of  heterozygous   parent   is  a parent  Aa   pair  of  alleles.  In  this  pair  gene  A  is  dominant  over  gene  a
5 0
3 years ago
Read 2 more answers
Other questions:
  • How many Angstroms are in a meter?
    13·2 answers
  • You are on the scene of a person down. you arrive at a college dormitory and find a 21-year-old patient lying supine on the floo
    5·1 answer
  • List the organelles that are found only in animal cells
    12·2 answers
  • Integrated Natural Resource Management Plans (INRMPs) are mutually agreed upon documents to protect the natural resources on mil
    8·2 answers
  • In typical relationships, one would expect the most bickering between _____.
    13·1 answer
  • Trace all the rivers connected to lake superior?
    9·1 answer
  • In the case of cancer, uncontrolled cell division is a problem because it. . lowers t-cell and lymphocyte production. . requires
    14·2 answers
  • Which Organelle is important because it contains the genetic information for a cell?
    10·1 answer
  • Lesson 11 part 1 introduction analyzing text structures
    8·2 answers
  • When Substance Y is applied the cell, the cell functions normally at first, but as time goes on, action potential amplitude grad
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!