Biology lab 3 | Biology homework help

Don't use plagiarized sources. Get Your Assignment on
Biology lab 3 | Biology homework help
Just from $13/Page
Order Now

Gregor Mendel used pea plants to study heredity in a series of experiments. Mendel worked by carefully observing and recording traits in successive generations of plants. Knowledge about DNA and chromosomes came later.

This lab will apply genetic laws to human inheritance using Punnett squares.

Recall that DNA is wound tightly into chromosomes. Cells with only one set of chromosomes, such as sex cells, are haploid. When two haploid cells fuse during fertilization, a diploid zygote with two full sets of chromosomes is formed. Most cells of a mature individual are diploid.

Homologous chromosomes have the same genes, but they might have different versions (alleles) of those genes. Diploid cells have two alleles for each gene. These alleles might be identical (gene A) or different (gene B). Each gene’s locus is its location on a chromosome.

Human traits come through dominant or recessive inheritance. For example, the cystic fibrosis traits carried by a dominant allele are always expressed, even if the recessive gene is present (FF or Ff). The recessive is only expressed when two copies of the recessive allele are present (ff).

 

 

Mother: Healthy carrier

 

 

F

f

 

 

Father: Healthy carrier

F

FF
Healthy non-carrier

Ff

Healthy carrier

f

Ff

Healthy carrier

FF

Affected

Human gender is carried on the X and Y chromosomes. Females are XX and males are XY. Heredity traits such as color blindness, which is the inability to distinguish among some colors, are carried on the X chromosome (Xc). The presence of one normal XC will allow normal vision.

In this next set of exercises, you will determine the genotypes of the parents by considering the inheritance patterns of traits in their children. The following is a table of the phenotypes of the family members:

 

Phenotype

Alleles

Parents

 

 

Mother

Not color blind

Freckles

Type B blood

XXC

Ff

IBi

Father

Color blind

No freckles

Type A blood

XcY

Ff

IAi

Children

 

 

Abby

Color blind

Freckles

XXc

Ff or ff

Brady

Not color blind

No freckles

XCY

ff

Carly

Not color blind

No freckles

XXC

ff

Dennis

Color blind

Freckles

XcY

Ff or ff

Exercise 1: Color Blindness

Using the alleles XC (not color blind) and Xc (color blind), distribute the gametes from each parent to the outside of the Punnett square. Drag and drop the child with the correct phenotype to the box within the Punnett square that has the corresponding genotype that would occur from the fusion of egg and sperm as indicated by your placement of the gametes.

 Color Blindness Punnett Square

Exercise 2: Freckles

Freckles are groups of cells on the skin that produce the pigment melanin, often in response to exposure to ultraviolet (UV) light. The gene for freckles is inherited in a dominant/recessive pattern. A person carrying even a single copy of the dominant allele (F) will have freckles. A person who is homozygous recessive (ff) will have no freckles.

Using the alleles F (freckles) and f (no freckles), distribute the gametes from each parent to the outside of the Punnett square. Drag and drop the child with the correct phenotype to the box within the Punnett square that has the corresponding genotype that would occur from the fusion of egg and sperm as indicated by your placement of the gametes.

 Freckles Punnett Square

Exercise 3: Blood Type

In codominance, more than one allele encodes a functional protein. IA codes for A markers on red blood cells. IB codes for B markers. i codes for neither A nor B markers, no markers. Human blood types IAIA and IAi are Type A blood. IBIB and IBi are Type B blood. IAIB is a codominant expression of alleles and results in type AB blood. ii is Type O blood.

Genotypes

Phenotypes

IAIA
or

IAi

Blood Type A

IBIB
or

IBi

Blood Type B

IAIB

Blood Type AB

ii

Blood Type O

These parents have a child with Type O (ii) blood. Investigate the possible genotypes for each parent to determine how this genetic outcome would occur. Why must each parent carry the i allele to have a child with Type O blood? Drag and drop the gametes from each parent to the outside of the Punnett square. Drag and drop the corresponding zygote to each block of the Punnett square.

 Blood Type Punnett Square

Reference

Audesirk, T., Audesirk, G., & Byers, B. E. (2008). Biology: Life on earth with physiology. Upper Saddle River, NJ: Prentice Hall.M

Calculate your paper price
Pages (550 words)
Approximate price: -

Why Choose Us

Quality Papers

At Myhomeworkwriters.com, we always aim at 100% customer satisfaction. As such, we never compromise o the quality of our homework services. Our homework helpers ensure that they craft each paper carefully to match the requirements of the instruction form.

Professional Academic Writers

With Myhomeworkwriters.com, every student is guaranteed high-quality, professionally written papers. We ensure that we hire individuals with high academic qualifications who can maintain our quality policy. These writers undergo further training to sharpen their writing skills, making them more competent in writing academic papers.

Affordable Prices

Our company maintains a fair pricing system for all academic writing services to ensure affordability. Our pricing system generates quotations based on the properties of individual papers.

On-Time delivery

My Homework Writers guarantees all students of swift delivery of papers. We understand that time is an essential factor in the academic world. Therefore, we ensure that we deliver the paper on or before the agreed date to give students ample time for reviewing.

100% Originality

Myhomeworkwriters.com maintains a zero-plagiarism policy in all papers. As such, My Homework Writers professional academic writers ensure that they use the students’ instructions to deliver plagiarism-free papers. We are very keen on avoiding any chance of similarities with previous papers.

Customer Support 24/7

Our customer support works around the clock to provide students with assistance or guidance at any time of the day. Students can always communicate with us through our live chat system or our email and receive instant responses. Feel free to contact us via the Chat window or support email: support@myhomeworkwriters.com.

Try it now!

Calculate the price of your order

You will get a personal manager and a discount.
We'll send you the first draft for approval by at
Total price:
$0.00

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Homework Writing Services

My Homework Writers holds a reputation for being a platform that provides high-quality homework writing services. All you need to do is provide us with all the necessary requirements of the paper and wait for quality results.

Essays

Essay Writing Services

At My Homework Writers, we have highly qualified academic gurus who will offer great assistance towards completing your essays. Our homework writing service providers are well-versed with all the aspects of developing high-quality and relevant essays.

Admissions

Admission and Business Papers

With Myhomeworkwriters.com, we will help you secure a position at your desired institution. Our essay writing services include the crafting of admissions papers. We will still help you climb your career ladder by helping you write the official papers that will help you secure a job. We will guide you on how to write an outstanding portfolio or resume.

Editing

Editing and Proofreading

Myhomeworkwriters.com has a professional editorial team that will help you organize your paper, paraphrase it, and eliminate any possible mistakes. Also, we will help you check on plagiarism to ensure that your final paper posses quality and originality.

Coursework

Technical papers

My Homework Writers harbors professional academic writers from diverse academic disciplines. As such, we can develop homework writing services in all academic areas. The simplicity or complexity of the paper does not affect the quality of homework writing services.