Multiple Choice
Which of the following best describes the phenotype of an individual?
305
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 for a recessive trait found on the X chromosome in females?
A
XrXr
B
XRXr
C
XRY
D
XX
Verified step by step guidance1
Understand that females have two X chromosomes, so their genotype for a trait on the X chromosome will involve two alleles, one on each X chromosome.
Recognize that a recessive trait requires two copies of the recessive allele to be expressed in females. This means both X chromosomes must carry the recessive allele.
Identify the notation: 'X^r' represents the X chromosome carrying the recessive allele, while 'X^R' would represent the dominant allele.
Determine that the genotype for a female expressing a recessive trait on the X chromosome must be 'X^rX^r', as both X chromosomes need to carry the recessive allele.
Eliminate other options: 'X^RX^r' would express the dominant trait, 'X^RY' is a male genotype, and 'XX' does not specify alleles.
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