answer.
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
kow
3 months ago
7

In cats, the Dense pigment gene, D/d, codes for melanophilin, a protein involved in the transportation and deposition of pigment

into a growing hair. A separate gene, M/m, is responsible for the production of the pigment, with M_ producing black pigment and mm producing brown. When a cat has two recessive d alleles, its fur is a light gray color regardless of which alleles of M/m are present.
Required:
State the phenotype and frequency for each of the following outcomes of a dihybrid cross:

a. M_D_
b. M__dd
c. mmD
d. mmdd
Biology
1 answer:
Rainbow [2.3K]3 months ago
7 0

Answer:

a. M_D_: 9/16 Individuals with black fur

b. M__dd: 3/16 Individuals with gray fur (1/16 MMdd + 2/16 Mmdd)

c. mmD_: 3/16 Individuals with brown fur (1/16 mmDD + 2/16 mmDd)

d. mmdd: 1/16 Individuals with gray fur.

Explanation:

Provided data includes:

  • The dense pigment gene, D, corresponds to melanophilin.
  • The D allele is dominant over d.
  • The M/m gene determines pigment production.
  • M is dominant over m.
  • With D present, M/m is expressed.
  • With dd, M/m is not expressed.
  • DDMM, DdMM, DDMm, DdMm result in black fur.
  • DDmm, Ddmm lead to brown fur.
  • ddMM, ddMm yield light gray fur.

Cross: between two dihybrids

Parental: DdMm x DdMm

Phenotype: Black-furred x Black-furred

Gametes: DM, Dm, dM, dm; DM, Dm, dM, dm

Punnet Square: DM Dm dM dm

DM DDMM DDMm DdMM DdMm

Dm DDMm DDmm DdMm Ddmm

dM DdMM DdMm ddMM ddMm

dm DdMm Ddmm ddMm ddmm

F1: 9/16 Black-furred individuals, D-M- (1/16 DDMM + 2/16 DDMm + 2/16 DdMM + 4/16 DdMm)

3/16 Brown-furred individuals, D-mm (1/16 DDmm + 2/16 Ddmm)

4/16 Gray-furred individuals, dd-- (1/16 ddMM + 1/16 ddmm + 2/16 ddMm)

You might be interested in
Why is it wrong to say that bread is a compound?
Rainbow [2354]

Clarification:

Bread should not be categorized as a compound. Compounds arise from the chemical bonding of two or more substances, whereas mixtures do not involve such chemical connections.

Bread represents a mixture of multiple compounds including sugars, proteins, lipids, and gases, as well as a culture of organisms or a chemical leavening agent. Many of these elements

Clarification:

Long chains of monomers form biological macromolecules that perform crucial functions in the body, including nucleic acids, carbohydrates, proteins, and lipids. These are organic compounds characterized by ring or long-chain carbon atoms connected to oxygen (O), hydrogen (H), nitrogen (N), and phosphorus (P).

  • Proteins act as structural support molecules composed of lengthy chains of amino acids that are linked by peptide (CONH) bonds; they consist of 20 unique units arranged into various macromolecules. Amino acids, absorbed during digestion, integrate into the body's cells to form organs, muscles, signaling molecules, and serve as a supplementary energy source.  Basic composition: C, H, O, N, S; featuring polar C=O double bonds and N-H bonding
  • Carbohydrates are primarily responsible for providing energy and structural support, mainly made up of sugars or starches that form long chains and rings constituting monosaccharide monomers. They encompass monosaccharides, disaccharides, and polysaccharides, which indicate the type of bonding and the complexity level of the polymers.  Basic composition: C, H, O - with numerous polar OH groups
  • Lipids serve as energy reserves and signaling molecules; these include fats, both saturated and unsaturated fatty acids with double bonds, as well as steroids and waxes. Lipids are formed from fatty acids and glycerol; they do not possess a defined set of monomers and, in contrast to other biological macromolecules, they are not polymers. The configuration of hydrophobic heads and tails from fatty acids can impart hydrophilic or hydrophobic attributes to these non-polar macromolecules.  Basic composition: C, H, O; non-polar - a triple condensation reaction leads to these molecules being produced from a triple hydroxyl (OH) alcohol linked to three long-chain carboxylic acids.

Discover more about lipid macromolecules at

Discover more about proteins and carbohydrates at

4 0
2 months ago
If you lined up human skin cells side-by-side, how many would fit along the length of the paperclip in the sample problem above?
lana [2441]

Hello,

You didn't mention the length of the paper clip, but after some research, I found that a typical small paperclip measures 3.0 cm. Thus, I'll frame my answer around this measurement.

A human cell averages about 30um, and the question inquires how many would align along the length of a paper clip measuring 3cm.

                                        3 cm = 30000 microns

                                           = 30000/30

                                           = 1000 cells.

Thus, if 1000 human skin cells were placed side-by-side, they would fit within the length of the paper clip.

Note: If your paper clip length differs in your exercise (like 1 cm), simply multiply 1 by 10000 and divide the resulting figure by 30 to determine how many cells fit along the length of any clip.

I hope this information is helpful!


4 0
2 months ago
Some fungi secrete substances that are toxic to bacteria that compete with them for food. Scientists have used their knowledge o
lana [2441]
D) antibiotics because these substances secreted by fungi can eliminate the bacteria present in your immune system when you are ill. 
7 0
3 months ago
People who have Alzheimer’s disease experience an increasing loss of brain function and cognition over time. Alzheimer’s is char
enyata [2506]
Recently, researchers have identified an enzyme, BACE2, which reduces these abnormal protein segments in the brains of Alzheimer's patients.
8 0
2 months ago
In general, the surface of a tree has a harder “feel” than does the surface of a dog. What cell characteristic or cell structure
Tresset [2298]
In trees and other plants, the presence of a cell wall gives the organism a protective barrier, contributing to its stiffness and rigidity, whereas animals lack this structure, allowing for greater movement.
4 0
3 months ago
Read 2 more answers
Other questions:
  • The conversation between madame valmondé and désirée gives an example of _____. select all that apply.
    15·2 answers
  • The condition measured in an experiment that results from changing conditions in the independent variable is
    12·1 answer
  • Rare species of plants can be cloned so they don't go extinct. To do this, stem cells are taken from the __________ of the plant
    13·1 answer
  • Since broth cultures of bacteria can reach high numbers of cells quickly, a series of answer experiments (one word) is required
    8·2 answers
  • Examine the image of the relatedness of vertebrates represented in this phylogenetic tree. Select all the statements that are su
    10·2 answers
  • The scientific name for the dog is Canis lupus. The scientific name for the domesticated cat is Felis catus. Dogs and cats live
    15·2 answers
  • What is the dependent variable in this statement? " Pools with dark pool tile heat up faster (i.e., have a higher temperature) i
    15·1 answer
  • Ground squirrels are found in many areas of the United States. They live in underground burrows and are often attacked by birds
    15·2 answers
  • The interior surface of a neuron's plasma membrane at resting membrane potential will have a ________.
    6·1 answer
  • Use the drop-down menus to match each example to the fossil topic discussed, then to show how the
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!