Question

1. which of these does not explain how a child inherits uhs?

a. each parent contributes one copy of the uhs gene
b. mutated dna is packaged into sperm or egg
c. fertilization joins the gametes to form a zygote
d. hair follicles directly transfer proteins to the embryo
ls.bio.6.2 construct an explanation to summarize how inheritable genetic variations may result from: new genetic combinations in meiosis, mutations during replication, or mutations caused by environmental factors.

1. why does meiosis create variation in traits like hair type?

a. it creates identical cells
b. it repairs mutations in the hair shaft
c. crossing over and independent assortment mix parental genes
d. it eliminates recessive alleles

1. which scenario would not cause inheritable variation?

a. a mutation in a sperm cell gene
b. uv radiation altering dna in an egg cell
c. hair - shaft damage from a flat iron
d. new gene combinations from crossing over

1. which event created the original uhs allele in humans?

a. crossing over during fertilization
b. a mutation in a hair - shaft gene
c. independent assortment of chromosomes
d. protein misfolding caused by hair products
ls.bio.7.1 predict the distribution of expressed traits: mendelian inheritance, incomplete, co dominance, multiple alleles, and sex - linked inheritance.

1. how does the uhs gene pass from parents to offspring?

a. through mrna during protein synthesis
b. through proteins in hair follicles
c. through mutations only in skin cells
d. through dna in gametes formed during meiosis

Explanation:

• Question 1: Meiosis creates variation through crossing over and independent assortment which mix parental genes. Option a is incorrect as meiosis creates non - identical cells. Option b is wrong as meiosis is not about repairing hair shaft mutations. Option d is incorrect as meiosis does not eliminate recessive alleles.
• Question 2: Hair - shaft damage from a flat iron is a somatic (non - reproductive cell) change and not passed on to offspring. Mutations in sperm or egg cells (options a and b) and new gene combinations from crossing over (option d) can cause inheritable variation.
• Question 3: A mutation in a hair - shaft gene (option b) would create a new allele. Crossing over during fertilization (option a) is incorrect as crossing over occurs during meiosis. Independent assortment (option c) shuffles existing alleles. Protein misfolding from hair products (option d) is not a genetic mutation that creates an allele.
• Question 4 (from the last part): Genes pass from parents to offspring through DNA in gametes (sperm and egg) formed during meiosis. mRNA (option a) is involved in protein synthesis but not in passing genes to offspring. Proteins in hair follicles (option b) do not transfer genes. Mutations only in skin cells (option c) are somatic and not passed on.

Answer:

1. C. Crossing over and independent assortment mix parental genes
2. C. Hair - shaft damage from a flat iron
3. B. A mutation in a hair - shaft gene
4. D. Through DNA in gametes formed during meiosis