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In Mendelians, curly hair is dominant to no hair. Consider a female Mendelian homozygous for...

Question:

In Mendelians, curly hair is dominant to no hair. Consider a female Mendelian homozygous for curly hair and a male Mendelian with no hair. What is the probability that these two Mendelians offspring will have curly hair?

Genetic inheritance

Certain traits are inherited by offspring from their parents. Some traits my be dominant, some may be recessive, codomiannt or even incompletely dominant. These traits are typically controlled by two genes, and the combination of alleles determine the phenotypic expression.

Answer and Explanation:

Dominant traits will be expressed over recessive traits. One can be homozygous dominant as well as heterozygous, in which the dominant trait will be expressed. One can also be homozygous recessive in which the recessive trait will be expressed. For this questions we will use "N" to identify the dominant curly hair trait and "n" to represent the recessive no hair trait. Because it is indicated that the mother is homozygous for curly hair, we know she is homozygous dominant (NN) and the male has no hair so we know he is homozygous recessive.

N N
n Nn Nn
n Nn Nn

In this scenario, all offspring (100%) will be heterozygous (Nn), which also means they will all express curly hair.


Learn more about this topic:

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Pedigree Analysis in Human Genetics: Inheritance Patterns

from Biology 102: Basic Genetics

Chapter 6 / Lesson 3
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