Multiple Choice
Which of the following is an example of an environmental effect on phenotype?
335
views
13. Mendelian Genetics
Genotype vs. Phenotype
Struggling with General Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the genotype of a 'normal' male with no hemophilia A?
A
X^H Y
B
X^H X^H
C
X^h Y
D
X^h X^h
Verified step by step guidance1
Understand that hemophilia A is a sex-linked recessive disorder, which means it is carried on the X chromosome.
Recognize that males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).
Identify that a 'normal' male with no hemophilia A must have a normal allele on his X chromosome, represented as X^H.
Since males have only one X chromosome, the presence of the Y chromosome does not carry the hemophilia gene, so the genotype for a normal male is X^H Y.
Review the options given: X^H Y is the correct genotype for a normal male with no hemophilia A, as it indicates the presence of a normal allele on the X chromosome and a Y chromosome.
3:39mWatch next
Master Dominant vs. Recessive Alleles with a bite sized video explanation from Jason
Start learningRelated Videos
Related Practice
Genotype vs. Phenotype practice set
Problem sets built by lead tutorsExpert video explanations