BIO100 Maricopa Community Bio Lab Human Genetics Report

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Trbetr2224

Science

BIO100

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i need assistance completing the lab, and need to get a good grade on it. i need someone who has a strong background in biology. this is for a bio100 class.

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Explanation & Answer

Attached.

Running head: LAB 8

1

Human Genetics Lab 8
Student’s Name
Institutional Affiliation
Date

LAB 8

2
Part 1

~~1.

List whether you are positive or negative for each characteristic and include

whether your phenotype for that characteristic is caused by dominant or recessive alleles.
(6 points)

Characteristic

Negative/Positive

Phenotype

a.

Blood group type

O

b.

Rh factor

Positive

Positive

c.

Widow's peak

Negative

Recessive

d.

Free ear lobes

Negative

Recessive

e.

Tongue rolling

Positive

Dominant

f.

Hitchhiker's thumb

Negative

Dominant

g.

Little finger bend

Negative

Recessive

h.

PTC taster

Negative

Recessive

i.

Mid-digit hair

Negative

Recessive

j.

Facial dimples

Negative

Recessive

k.

Freckles

Positive

Dominant

LAB 8
l.

~~2.

Cleft chin

3
Negative

Recessive

If an individual knows only his own blood group type and but not his parent’s

blood types, can he tell if his blood type genotype is heterozygous or homozygous?
Explain. (5 points)
The person can tell his blood type without the blood group type of the parent. Th e blood
group genotyping is characterized by presence of glycoproteins that determine the blood
group as either A, B, AB or O. The presence of both glycoproteins A and B shows a
genotype of AB while absence demonstrates O which is the recessive gene. The A and B
alleles express co-dominance in a heterozygote person while O is recessive thus an
individual with both AO or BO is heterozygous.

~~3.

Create and label a Punnett square to determine the possibility of a couple having a

color-blind child if the mother has the recessive trait on one X and the father has normal
vision. HINT: Use Xb to indicate an X with the color-blindness trait. (4 points)

XB

Xb

XB

XBXB

XBXb

Y

XBY

XbY

LAB 8

4

1 XBXB –Not color blind child

2 XBXb- Not color blind child

3 XBY- Not color blind child

4 XbY- color blind child

The possibility of having a color blind child is ¼=25%

~~4.

From your Question 3 Punnett square results, what percentage of female offspring

will be color-blind? What percentage of male offspring will be color-blind? (2 points)
The percentage of female offspring will color-blind is 0% while the percentage of male
offspring will be c...


Anonymous
Excellent resource! Really helped me get the gist of things.

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