A color-blind, chromatin-positive male child (one Barr body) has a maternal grandfather who was color-blind. The boy's mother and father are phenotypically normal

Construct and support (using appropriately labeled diagrams) a rationale whereby the chromosomal and genetic attributes of the chromatin-positive male are fully explained.


The female (mother) must be heterozygous and undergo nondisjunction at meiosis II to produce the XrgXrgY boy.

Biology & Microbiology

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Karyotype analysis

a. is a means of detecting and reducing mutagenic agents. b. is a surgical technique that separates chromosomes that have failed to segregate properly during meiosis II. c. is a diagnostic tool to detect chromosomal mutations. d. substitutes defective alleles with normal ones. e. fits all of these descriptions.

Biology & Microbiology

The two MAJOR divisions of the nervous system are the

a. autonomic and peripheral systems. b. sympathetic and parasympathetic systems. c. cranial and spinal nerves. d. central and peripheral nervous systems. e. brain and spinal cord.

Biology & Microbiology

The field of genetics includes

A) the study of heredity. B) the molecular nature of the genetic material. C) the ways in which genes control life functions. D) the distribution and behavior of genes in populations. E) All of these

Biology & Microbiology

Infection with Pediculus humanus is called scabies

Indicate whether the statement is true or false

Biology & Microbiology