Bio 130 – Quiz March 28

two gamete types: white/white and purple/purple Q. 1 - Imagine crossing a pea heterozygous at the loci for flower color (white versus purple) and seed color (yellow versus green) with a second pea homozygous for flower color (white) and seed color (yellow). What types of gametes will the first pea produce? two gamete types: white/white and purple/purple two gamete types: white/yellow and purple/green four gamete types: white/yellow, white/green, purple/yellow, purple/green four gamete types: white/purple, yellow/green, white/white, and purple/purple one gamete type: white/purple/yellow/green Answer: c The purpose of this question is to help students figure out gamete types—a step they often rush past. Students need to realize that gametes are haploid and that each gamete contains one, and only one, allele for each of the traits being studied. The presence of the second pea in the question stem is a distracter. Answer a is wrong because it shows gametes with two alleles for flower color and no alleles for seed color. Answer b is wrong because it shows only two possible gamete types. Answer c is right because it shows all four possible gamete types. Answer d is wrong because it shows gametes that are diploid for one trait and containing an allele for only one locus. Answer e is wrong because it shows a gamete diploid for both loci.

the blending model of genetics. true-breeding. dominance. Q. 2 - A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates the blending model of genetics. true-breeding. dominance. a dihybrid cross. the mistakes made by Mendel. Answer: c

Q. 3 – In dachsunds Brown hair (B) is dominant to yellow hair (b) Q. 3 – In dachsunds Brown hair (B) is dominant to yellow hair (b). Curly hair (C) is dominant to straight hair (c). We mate a female BBcc with a male bbCC. What is the chance of a puppy with yellow curly hair? 1/4 1/8 3/8 3/16

Q. 4 – In dachsunds Brown hair (B) is dominant to yellow hair (b) Q. 4 – In dachsunds Brown hair (B) is dominant to yellow hair (b). Curly hair (C) is dominant to straight hair (c). We mate a female BbCc with a male bbCC. What is the chance of a puppy with yellow curly hair? ½ ¼ 1/8 3/8 1/16