Exam 11: Mendel and the Gene Idea

Radish flowers may be red,purple,or white.A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring.The part of the radish we eat may be oval or long,with long being the dominant trait.If true-breeding red-flowered long radishes are crossed with true-breeding white-flowered oval radishes,the F₁ will be expected to be which of the following?

When crossing an organism that is homozygous recessive for a single trait with one that is heterozygous for the same trait,what is the chance of producing an offspring with the homozygous recessive phenotype?

Which of the following events of meiosis I confirms Mendel's second law of independent assortment?

Given the following cross between parents of the genotypes AABBCc × AabbCc,assume complete dominance for each trait and independent assortment.What proportion of the progeny will be expected to phenotypically resemble the first parent?

A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative.Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r,respectively.Which of the following is a possible phenotype for the father?

In certain plants,the tall trait is dominant to the short trait.If a heterozygous plant is crossed with a homozygous tall plant,what is the probability that the offspring will be short?

In humans,wavy hair occurs in heterozygotes (H^SH^C)offspring of people with straight hair (H^SH^S)and curly hair (H^CH^C).Which of the following crosses would produce offspring with the ratio of 1 straight:2 wavy:1 curly?

Tallness (T)in snapdragon plants is dominant to dwarfness (t),and red (C^R)flower color is not dominant to white (C^W).The heterozygous condition results in pink (C^RC^W)flower color.If snapdragons are heterozygous for height as well as for flower color,a mating between them will result in what ratio?

What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?

Labrador retrievers are black,brown,or yellow.In a cross of a black female with a brown male,results can be all black puppies,1/2 black to 1/2 brown puppies,or 3/4 black to 1/4 yellow puppies.These results indicate which of the following about the inheritance pattern of fur color in Labrador retrievers?

A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative.Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r,respectively.Which of the following is a possible genotype for the son?

Drosophila (fruit flies)usually have long wings (+ is the symbol used to represent this allele),but mutations in two different genes can result in bent wings (bt)or vestigial wings (vg).The bent and vestigial wing alleles segregate independently.In symbolizing fruit fly alleles,it is common to use two letters as opposed to only one.If flies that have long wings and are heterozygous for both the bent wing gene and the vestigial wing gene are mated,what is the probability of offspring with bent wings only?

Two plants are crossed,resulting in offspring with a 3:1 ratio for a particular trait.What does this suggest about the trait?

In the cross AaBbCc × AaBbCc,what is the probability of producing the genotype AABBCC?

Which of the following calculations described in the following statements require that you use the addition rule?

Which of the following statements correctly describes one difference between the law of independent assortment and the law of segregation?

Radish flowers may be red,purple,or white.A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring.The part of the radish we eat may be oval or long,with long being the dominant trait.True-breeding red-flowered long radishes are crossed with true-breeding white-flowered radishes.All of the F₁ offspring are purple-flowered and long radishes.The flower color trait in radishes is an example of which of the following types of inheritance?

Phenylketonuria (PKU)is a disease in humans that results from the abnormal metabolism of the amino acid phenylalanine.If untreated,it can lead to severe brain damage in infants.Two normal parents have a child who has PKU.What can you determine about the inheritance of the PKU allele from this information?

All seven of the pea plant traits studied by Mendel obeyed the principle of independent assortment.Which of the following statements correctly describes what this indicates about those traits?

Which of the following describes the ability of a single gene to have multiple phenotypic effects?