I. Epidermis

The Integumentary System

D. Stratum spinosum

E. Stratum basale

♂

♀

Rx—Albinism

1. Melanocytes

Rx—Malignant Melanoma

1. Melanocytes

♂

♀

An individual who produces as much melaninas humanly possible has genotype MMLLNN.That person’s phenotype would be to have verydark skin, so brown as to almost appear black.

During meiosis, the diploid (2n) genotype, MMLLNN,Is reduced to the haploid genotype. As the alleles aresegregated from each other, the only possibility for thesperm or egg is MLN.

+

The union of one genetic half-cell, the sperm, with the other genetic half-cell, the egg, results in one genetically whole cell, the zygote

Section 15-1

♀/♂ MLN

MLN

Add the alleles from the sperm (MLN) and the alleles from the egg (MLN) to determine the genotype of the zygote (and

the new individual), (MMLLNN)

An individual who produces as little melaninas humanly possible has genotype mmllnn.That person’s phenotype would be to have verylight skin, so as to appear so white that the pinkof the blood shows through.

During meiosis, the diploid (2n) genotype, mmllnnis reduced to the haploid genotype. As the alleles aresegregated from each other, the only possibility for thesperm or egg is mln.

Add the alleles from the sperm (mln) and the alleles from the egg (mln) to determine the genotype of the zygote (and

the new individual)

♀/♂ mln

mln

Add the alleles from the sperm (MLN) and the alleles from the egg (mln) to determine the genotype of the zygote (and

the new individual)

♀/♂ MLN

mln

During meiosis, the diploid (2n) genotype, MmLlNnis reduced to the haploid genotype. As the allelessegregate and assortindependently, maximumdiversity results.

♀/♂ MLN MLn MlN Mln mLN mLn mlN mln

MLN

MLn

MlN

Mln

mLN

mLn

mlN

mln

Add the alleles from the sperm (MLN) and the alleles from the egg (MLN) to determine the genotype of the zygote (and

the new individual), (MMLLNN)

♀/♂ MLN MLn MlN Mln mLN mLn mlN mln

MLN

MLn

MlN

Mln

mLN

mLn

mlN

mln

The number of alleles coding for the cells to make melanin determine how genetically dark the

individual’s hair, skin, or eyes will be. Count up the alleles and total them in the first square

Number of Alleles Number of Individuals (out of 64)

6

5

4

3

2

1

0 0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

0 1 2 3 4 5 6

Number of Alleles

Num

ber o

f Ind

ivid

uals

Now, plot the data on the graph, with the numbers of alleles on the x-axis and the number of individuals on the y-axis.

II. Dermis

A. Hair

B. Sebaceous (Oil) Glands

Rx—Acne

Epidermis

C. Sudoriferous (Sweat) Glands

II. Dermis

1. Eccrine glands

2. Apocrine glands

C. Sudoriferous (Sweat) Glands

II. Dermis

3. Ceruminous glands

4. Mammary glands

D. Dermal Blood Vessels

E. Nerve Endings

III. Subcutaneous Layer (Hypodermis)

Rx—Burns

1. First degree

2. Second degree

3. Third degree

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

Rx—Burns & Circulatory Shock

increased heart rate

Rx—Burns & Circulatory Shock