Copy of 20 Points for Unit 6 Test! (5/2/2026)

Lesch-Nyhan syndrome (LNS) is an x-linked recessive disorder (X^d) that affects a child’s brain and behavior. A woman who has Lesch-Nyhan syndrome is expecting a child with a man who does not have the disorder. What is the probability their child has the disorder?

Patterns of snake scales and tongue width are traits inherited from parent to offspring. Ring patterns (R) are dominant to lined patterns (r). Thin tongues (T) are dominant to wide tongues (t).

A snake who is homozygous dominant for both traits mates with a snake who is heterozygous for both traits. What would be the genotype of an offspring with a ring pattern and thin tongue?

Tuberous sclerosis is a genetic disorder that causes brain tumors in 1 out of every 10,000 people. Tuberous sclerosis (T) is a dominant disorder while healthy individuals are recessive (t). What percent of offspring would be expected to be healthy if a heterozygous male with tuberous sclerosis mates with a healthy female?

In a population of beetles, some have yellow wings, some have red wings, and some have orange wings. The allele for yellow wings (W^Y) is incompletely dominant over the allele for red wings (W^R), so heterozygous beetles have orange wings. Which cross has the highest probability of producing offspring with orange wings?

5) In ducks, Brown feathers (F^B) and Green feathers (F^G) are codominant. Heterozygous ducks have brown-green feathers (F^BF^G). If a heterozygous duck with brown-green feathers mates with another heterozygous duck with brown-green feathers, what would be the expected phenotypic outcome of the offspring?