Answered: male with autosomal dominant brown hair…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Related questions

Question

A male with autosomal dominant brown hair and a female with unknown hair color have 3 sons with recessive blonde hair. What is the male’s genotype?

What are the possible genotype(s) and phenotype(s) [hair color] of the female?

Expert Solution

Step 1: Introduction to laws of inheritance

The laws of inheritance also known as Mendelian laws or Mendel's laws are a set of fundamental principles in genetics established by the Austrian scientist Gregor Mendel in the 19th century.

These laws describe how traits are passed from one generation to the next and provide the basis for our understanding of inheritance patterns in organisms.

Mendel's work with pea plants laid the foundation for the science of genetics.

There are three main laws of inheritance:

1. Law of Segregation (The First Law):

The Law of Segregation states that an individual has two alleles for each gene, one inherited from each parent.
During the formation of gametes (sperm and egg cells), these alleles segregate or separate from each other randomly so that each gamete receives only one allele for each gene.
This law explains why offspring inherit one allele for a specific trait from each parent.

Law of Independent Assortment (The Second Law):

The Law of Independent Assortment states that genes located on different chromosomes segregate independently during gamete formation.
In other words, the inheritance of one gene does not affect the inheritance of another gene on a different chromosome.
This law explains the inheritance of traits that are controlled by genes on different chromosomes.

Law of Dominance (The Third Law):

According to this Law some alleles are dominant and others are recessive.
Dominant alleles mask the expression of recessive alleles in a heterozygous individual (one with two different alleles for a gene).
Only when an individual has two recessive alleles (homozygous recessive) does the recessive trait become observable in the phenotype.