Unit Test Answers

A pedigree chart for a genetic trait is shown below. The trait of interest is carried by a dominant allele, and individuals expressing the trait are represented by the shaded shapes.How do you know that individual 1 is heterozygous for the trait?

The pedigree traces red-green color blindness. Which family members have red-green color blindness?

Which is likely to be the most important contribution of genetic engineering to the practice of selective breeding?

In roses, red flowers and long stems are dominant traits. A rose plant that is homozygous for both red flowers and long stems is crossed with a rose plant that is heterozygous for red flowers and homozygous for short stems. What percentage of the offspring will exhibit red, long-stemmed flowers?

Which represents the cross between parent plants if one is heterozygous and has yellow-colored pods and the other is homozygous and has green-colored pods?

The Punnett square predicts the ratio of genotypes in the offspring based on the genotypes of the parents. Which Punnett square represents a cross between a mom who is heterozygous for dimples and a dad who is homozygous for no dimples?

Laura's mother is shown in the image. Which trait is Laura least likely to inherit from her mother?

Which process is the opposite of inbreeding?

Who would be the best people to study to help assess how genetics and the environment influence the expression of traits?

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. Which Punnett square represents the correct way to set up the cross RRYy ´ RrYY?

A cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. Purple offspring result due to incomplete dominance. Then, two of the purple offspring are crossed. What proportion of the offspring from the second cross will be purple?

The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape.What is the phenotypic ratio of the offspring?

Black fur in cats is inherited though simple dominance. In the pedigree chart below, black indicates black fur and white indicates white fur. This pedigree chart might be used to help a cat breeder produce kittens that have white fur only.Which individual in the third generation should the cat breeder choose to breed a litter of kittens that are all white?

Some flowering plants appear to have offspring that have traits that are intermediate between those of the parents. Which type of dominance is exhibited by the offspring?

Svetlana and her mother are very similar. Both have blonde hair, a love of scrapbooking, blue eyes, and a thin nose. Which statement most likely describes Svetlana’s traits?