X-Linked Traits and Pedigree Analysis

Fill in the Blank (converted to MCQ). Use the word bank to choose the best answer: carrier; X-linked recessive; pedigree; sex chromosomes.

• X-linked recessive

• Pedigree

True or False (converted to MCQ). Statement: Fathers pass their X chromosome to all sons.

• True

• False

Tags

NGSS.HS-LS3-1

Multiple Choice. A pedigree shows many affected males and no father-to-son transmission. Which pattern fits best?

• Autosomal dominant

• X-linked recessive

Short Answer (converted to MCQ). Why can fathers not pass X-linked recessive traits to sons?

• Fathers pass Y chromosomes to sons and X chromosomes to daughters.

• Fathers pass X chromosomes to sons and Y chromosomes to daughters.

Tags

NGSS.HS-LS3-1

Matching. Terms: A. X-linked recessive; B. Carrier; C. Pedigree; D. Hemizygous; E. Hemophilia; F. Color blindness; G. X-linked dominant; H. Y-linked. Match each description to the correct term: Describes males with one copy of X-linked genes (XY) for which no second allele exists; Individual with one recessive allele who can pass it on but typically shows no symptoms; Trait passed from father to all sons only; never through daughters; Family chart used to trace inheritance across generations.

• Carrier

• Trait passed from father to all sons only; never through daughters

• Y-linked

• Family chart used to trace inheritance across generations

• Hemizygous

• Describes males with one copy of X-linked genes (XY) for which no second allele exists

• Pedigree

• Individual with one recessive allele who can pass it on but typically shows no symptoms

Matching. Terms: A. X-linked recessive; B. Carrier; C. Pedigree; D. Hemizygous; E. Hemophilia; F. Color blindness; G. X-linked dominant; H. Y-linked. Match each description to the correct term: Classic X-linked bleeding disorder used in genetics examples; Common X-linked vision condition affecting red–green perception; Pattern where one copy on the X produces the trait in both sexes; Pattern where males are more often affected and female carriers transmit to sons.

• Color blindness

• Pattern where one copy on the X produces the trait in both sexes

• X-linked dominant

• Pattern where males are more often affected and female carriers transmit to sons

• X-linked recessive

• Common X-linked vision condition affecting red–green perception

• Hemophilia

• Classic X-linked bleeding disorder used in genetics examples

Fill in the Blank (Word Bank: carrier, X-linked recessive, pedigree, sex chromosomes, color blindness, hemophilia). Traits more often affect males because they have a single X.

• Mitochondria

• Autosomal recessive

• X-linked recessivel

• Y-linked

Fill in the Blank (Word Bank: carrier, X-linked recessive, pedigree, sex chromosomes, color blindness, hemophilia). In an X-linked recessive pattern, a female with one mutant allele is a ______ who can pass it to sons.

• Affected female

• Hemizygote

• Proband

• Carrier

Fill in the Blank (Word Bank: carrier, X-linked recessive, pedigree, sex chromosomes, color blindness, hemophilia). A family-history chart used to trace traits is a ______.

• Punnett square

• Pedigree

• Karyotype

• Linkage map

Fill in the Blank (Word Bank: carrier, X-linked recessive, pedigree, sex chromosomes, color blindness, hemophilia). A classic human X-linked bleeding disorder is ______, which involves clotting factor genes.

• Albinism

• Sickle-cell disease

• Cystic fibrosis

• Hemophilia