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
babunello [35]
3 years ago
13

In a diploid species of plant, the genes for plant height and fruit shape are syntenic and separated by 18 m.u. Allele D produce

s tall plants and is dominant to d for short plant, and allele R produces round fruit and is dominant to r for oval fruit.
a. Identify the gametes for a plant with the genotype DR/dr, label parental and recombinants and give the frequency of each gamete type.
b. Give the same information for a plant with genotype Dr/dR
Biology
1 answer:
KiRa [710]3 years ago
6 0

Answer and Explanation:

Crossing-over between two genes that are very close to each other in the chromosome is not that common. Crossing-over during meiosis occurs random positions all along the chromosome. Then, crossing-over frequency between two genes depends on the distance between them. A short distance between genes is a very little target for crossing-over to occur, which means that only a few of them will happen, compared with the number of events between genes that are more separated between each other.

  • Two genes that are very close will have a few recombination events and are strongly bounded.
  • Two separated genes will have more chances of recombination and are not bound.

To calculate the recombination frequency, we have to know that 1% of recombinations = 1 map unit = 1cm. And that the maximum recombination frequency is always 50%.  

The map unit is the distance between the pair of genes for which the recombination frequency is 1 in 100 meiotic products.

So, en the exposed example:

a.

Identify the gametes for a plant with the genotype DR/dr and label parental and recombinants

Gametes     DR parental type

                   Dr  recombinant type

                   dr  parental type

                  dR recombinant type

Give the frequency of each gamete type.

               18 map units = 18 % of recombination in total

                                    = % Dr + % dR

                                     = 9% + 9%

                100% - 18% = 82% of parental in total =

                                    = % of DR + % dr

                                    = 41% + 41%

The frequency for each gamete is:

DR 41%

dr 41%

Dr 9%

dR 9%

b.

Identify the gametes for a plant with the genotype Dr/dR

Gametes     Dr parental type

                   DR  recombinant type

                   dR  parental type

                   dr recombinant type

Give the frequency of each gamete type.

              18 map units = 18 % of recombination in total  

                                     = % DR + % dr

                                     = 9% + 9%

                100% - 18% = 82% of parental in total =

                                    = % of Dr + % dR

                                    = 41% + 41%

The frequency for each gamete is:

Dr 41%

dR 41%

dr 9%

DR 9%  

You might be interested in
To determine the presence and concentration of water pollutants, scientists are least likely to usea. chemical analysis of water
sergey [27]

Answer:

B. satellite photographs.

Explanation:

Technology can be defined as a branch of knowledge which typically involves the process of applying, creating and managing practical or scientific knowledge to solve problems and improve human life. Technologies are applied to many fields in the world such as medicine, information technology, cybersecurity, engineering, environmental etc.

Basically, knowing how to use a technology simply means a scientist understands the appropriate method or technique to be used in the application of a technology such as when solving a problem. Also, knowing when to use a technology means to know the appropriate time to use a particular technology without it having any repercussion or adverse effect.

Pollution can be defined as the physical degradation or contamination of the environment through an emission of harmful, poisonous and toxic chemical substances.

In order to determine the presence and concentration of water pollutants, scientists are most likely to use the following techniques;

I. Chemical analysis of water samples.

II. Analysis of indicator species.

III. Genetically engineered bacteria and yeasts.

IV. Chemical analysis of sediment.

However, satellite photographs are likely to be used to get a graphical illustration of the physical environment.

3 0
3 years ago
Plasmids are naturally found in some ____________________.
Olenka [21]
A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some eukaryotes.
8 0
3 years ago
Please help!!!!!! its easy, but help asap, first gets brainliest!
olchik [2.2K]

Answer:

A 1

B 3

C 9

D 8

E 5

F 6

G 2

H 4

I 7

Explanation:

This is an animal cell because it is shown to be rounded or curved (whereas plant cells would have straight lines as the outer layer). Cells are made up of parts called organelles, which are what we are labelling.

A 1 Nucleus

The nucleus is the "control centre" of the cell and where DNA is stored. It is typically drawn to be round and having another circle inside it (nucleolus).

B 3 Rough Endoplasmic Reticulum

The Rough ER (for short) is part of the transport system of the cell. It has ribosomes unlike the smooth ER, which makes it "rough" (notice the small dots on the structure). Ribosomes are partially made in the rough ER.

C 9 Plasma Membrane

The plasma membrane is the outermost protection layer for the cell. It controls what comes in and goes out of the cell and also provides a structure. It may also be called the "semi-permeable membrane" because it only allows some substances to pass through it.

D 8 Cytoplasm

The arrow seems to be pointing to an empty space of purple, and this purple is found throughout the entire cell like a background. The cytoplasm suspends all other organelles, allows movement within the cell and provides structure.

E 5 Golgi apparatus

Also known as the "golgi body", its job is to package proteins and prepare them for transport. It often looks like a stack of something in side view.

F 6 Mitochondria

The mitochondria is the powerhouse of the cell because it's where cellular respiration happens (produces energy). It usually is drawn with squiggly lines inside an ovular shape.

G 2 Ribosome

Ribosomes is where protein synthesis happens. They are found all over the cell and are really small. They begin their journey in the nucleus, travel through the rough ER, are packaged in the golgi apparatus, then directed to where they are needed.

H 4 Smooth Endoplasmic Reticulum

The smooth ER (for short) is also a part of the transport system. Unlike the rough ER, it does not have ribosomes. Its jobs include regulating calcium levels and making lipids (fat).

I 7 Lysosome

Lysosomes are like Lysol (if this helps you remember). It does the "cleaning" in the cell. It has enzymes that digest dead organelles and food.

5 0
3 years ago
Please help im timed!! ill make you brainliest!!!!
valentinak56 [21]

Answer:

<h2>c.<u>P</u><u>h</u><u>o</u><u>t</u><u>o</u><u>s</u><u>y</u><u>n</u><u>t</u><u>e</u><u>s</u><u>i</u><u>s</u><u> </u><u>p</u><u>r</u><u>o</u><u>d</u><u>u</u><u>c</u><u>e</u><u>s</u><u> </u><u>c</u><u>a</u><u>r</u><u>b</u><u>o</u><u>n</u><u> </u><u>d</u><u>i</u><u>o</u><u>x</u><u>i</u><u>d</u><u>e</u><u>,</u><u> </u><u>a</u><u>n</u><u>d</u><u> </u><u>c</u><u>e</u><u>l</u><u>l</u><u>u</u><u>l</u><u>a</u><u>r</u><u> </u><u>r</u><u>e</u><u>s</u><u>p</u><u>i</u><u>r</u><u>a</u><u>t</u><u>i</u><u>o</u><u>n</u><u> </u><u>u</u><u>s</u><u>e</u><u>s</u><u> </u><u>c</u><u>a</u><u>r</u><u>b</u><u>o</u><u>n</u><u> </u><u>d</u><u>i</u><u>o</u><u>x</u><u>i</u><u>d</u><u>e</u><u>.</u></h2><h2>Explanation:</h2><h2>hope it help</h2>

add brainliest

5 star

THANK YOU

3 0
3 years ago
A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water, equal to
Temka [501]

Answer:

I think its B. because the patients red blood cells will burst because the blood is hypertonic compared to the cells

7 0
3 years ago
Other questions:
  • Which study led biologists to infer that the ancient archosaur was active during the night? ancestral state reconstruction sugge
    13·1 answer
  • Which of the following includes the medulla, pons, cerebellum, and reticular formation and governs functions such as balance and
    11·1 answer
  • Most archaeal cell walls consist of ____; most bacterial cell walls consist of a polymer of peptides and polysaccharides.
    9·1 answer
  • Which is the best definition of resistance?
    11·1 answer
  • Researchers have recently sequenced the genetic identities of nine ancient fully modern H. sapiens from sites in Italy, France,
    11·1 answer
  • The xylem is made from ________. the xylem is made from ________. elongated living cells intercellular spaces between cells tubu
    8·2 answers
  • If the amount of oxygen improved by a plant or measure of a 24 hour. When would you expect the greatest not a function to be pro
    9·1 answer
  • If you say that a ground squirrel has greater evolutionary fitness than another ground squirrel in the same population, you mean
    13·1 answer
  • PLEASE HELP ASAP!!!!
    5·1 answer
  • Which of the following is considered to be a boundary between two different air masses?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!