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
Ulleksa [173]
2 years ago
12

In humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman wi

th blue eyes and normal color vision whose father was color-blind marries a man who also has normal color vision. He has brown eyes but his mother had blue eyes. Which of the following would you expect to be TRUE for their daughters?A) One-half of their daughters will have normal color vision and brown eyes; 1/2 of their daughters will have normal color vision and blue eyes.
B) Their daughters will all have normal color vision and have blue eyes.
C)Their daughters will all have normal color vision and brown eyes.
D) One-fourth of their daughters will be color blind and have blue eyes, 1/4 of their daughters will be Color blind and have brown eyes, 1/4 of their daughters will have normal color vision and blue eyes, 1/4 of their daughters will have normal color vision and brown eyes.
E) One-half of their daughters will be color blind and have blue eyes; 1/2 their daughters will be color blind and have brown eyes.
Biology
1 answer:
sergiy2304 [10]2 years ago
8 0

Answer:

A) One-half of their daughters will have normal color vision and brown eyes; 1/2 of their daughters will have normal color vision and blue eyes.

Explanation:

<u>The genotypes and phenotypes are</u>:

  • BB or Bb= brown eyes
  • bb= blue eyes
  • XᴰXᴰ, XᴰXᵈ (women) or XᴰY (men)= normal vision
  • XᵈXᵈ (women) or XᵈY (men) = color blind

A woman has blue eyes (bb) and normal color vision (she has an Xᴰ chromosome) but her father was color-blind, so the other X chromosome she has carries the recessive d allele. She has the genotype bb XᴰXᵈ.

The man has normal color vision (he is XᴰY) and has brown eyes, but his mother had blue eyes so he must have inherited a b allele from her and is therefore heterozygous Bb. His genotype is BbXᴰY.

The blue/brown eyes gene is autosomal and independent from the sex-linked color blindness gene.

The woman can produce the gametes b Xᴰ and b Xᵈ.

The man can produce the gametes B Xᴰ, b Xᴰ, B Y and bY.

<u />

<u>The female daughters can have the following genotypes and phenotypes:</u>

  • Bb XᴰXᴰ brown eyes, normal color vision
  • Bb XᴰXᵈ brown eyes, normal color vision
  • bb Xᴰ Xᴰ blue eyes, normal color vision
  • bb Xᴰ Xᵈ blue eyes, normal color vision

You might be interested in
Which part of the nucleotide is responsible for the coding of specific traits in an organism?
Marrrta [24]
The sequence of nitrogenous bases. Think of adenine guanine cytosine and thymine, and how they are ordered
8 0
2 years ago
Resethelp 1. Structure describes the alpha-helices and beta-sheets that are formed by hydrogen bonding between backbone atoms lo
ss7ja [257]

1. Answer;

-secondary structure;

Explanation;

Protein secondary structure refers to regular, repeated patterns of folding of the protein backbone. The two most common folding patterns are the alpha helix and the beta sheet. In an alpha helix, the polypeptide backbone coils around an imaginary helix axis in clockwise direction. In the beta sheet secondary structure, the polypeptide backbone is nearly fully extended. The R-groups are alternately pointed above and then below the extended backbone.

2. Answer;

- Quaternary structure

Explanation;

-Many proteins are formed from more than one polypeptide chain. The Quaternary structure describes the way in which the different subunits are packed together to form the overall structure of the protein. For example, the human hemoglobin molecule shown below is made of four subunits.

3. Answer;

-Tertiary structure

Explanation;

Tertiary structure refers to the overall folding of the entire polypeptide chain into a specific 3D shape. The tertiary structure of enzymes is often a compact, globular shape.

The tertiary structure is the structure at which polypeptide chains become functional. At this level, every protein has a specific three-dimensional shape and presents functional groups on its outer surface, allowing it to interact with other molecules, and giving it its unique function.

4. Answer;

Primary structure

Explanation;

-It is the simplest level of protein structure and is simply a sequence of amino acids in a polypeptide chain. For example, the hormone insulin has two polypeptide chains, A and B. Each chain has its own set of amino acids, assembled in a particular order. For instance, the sequence of the A chain starts with glycine at the N-terminus and ends with asparagine at the C-terminus, and is different from the sequence of the B chain.

7 0
3 years ago
Neurotransmitters can __________________ receptors to turn them on or __________________ them to stop them from transmitting.
NikAS [45]

Neurotransmitters can excite receptors to turn them on and stop them from transmitting.

A neuron releases a signaling chemical called a neurotransmitter across a synaptic gap to influence another cell. Any major body component or target cell that receives the signal may be another neuron, but it could also be a gland or muscle cell. These signals enable you to move your limbs, experience sensations, maintain your heartbeat, as well as receive and process all the information your body receives from other internal body components and your environment. From one neuron (nerve cell) to the following target cell, neurotransmitters transfer chemical signals, or "messages."

The majority of estimates suggest that the neurotransmitter transient lasts only a few hundred to several hundred of microseconds, indicating that post-synaptic activation is marked by a significant degree of non-equilibrium.

Learn more about neurotransmitters here: brainly.com/question/13593873

#SPJ4

5 0
2 years ago
When neither gene in a genotype pair is dominant and neither gene is recessive, the genes are said to be _____. multiple alleles
uranmaximum [27]
It is called incomplete dominance.
4 0
3 years ago
Read 2 more answers
Glacial episodes are an example of _______. a. positive feedback b. negative feedback c. the “Daisy model” d. the Gaia hypothesi
morpeh [17]
<span>This is a positive feedback. These episodes make the next glacial period even more severe and long-lasting than the one prior. This is due to the reflectance of the surface of the land having a positive relationship with how much energy is absorbed: as the reflectance increases, absorption decreases, and the glacial period increases in severity.</span>
7 0
2 years ago
Other questions:
  • What are the lines called that show land elevations on a contour map?
    7·1 answer
  • A human cell has 5 glucose molecules, 2 pyruvate molecules and 1 acetyl-CoA. If oxygen is not available, how many ATP would be g
    14·1 answer
  • The length of time required for half of the radioactive atoms in a sample to decay is its
    12·2 answers
  • The basic living unit of all plants and animals is a
    5·2 answers
  • The map above shows B blood group frequencies across eastern Asia and far western Europe. There is a gradual change in the chara
    6·1 answer
  • The period during which a heart chamber is contracting is called . 2. The period during which a heart chamber is relaxing is cal
    13·1 answer
  • 4. Briefly state four effects of high humidity on<br>living organisms​
    14·1 answer
  • HELPPP !! Inside compact bone, osteons are filled with which of the following? select all that apply
    5·2 answers
  • Two sisters are born from a father who has blue eyes and a mother who has brown eyes. One sister has blue eyes, and the other ha
    14·2 answers
  • people of india confound traditional racial categories because they fit most closely in terms of biological characteristics with
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!