Biology Unit 8 - PQ
Tongue rolling is dominant to non-tongue rolling. A man who is a homozygous tongue roller and his non-tongue rolling wife has a child. What is the chance that the child will be non-tongue rolling?
0%
How many genetically different gametes are produced by a pea plant with a genotype of RRTT?
1
An allele on the X chromosome is responsible for the recessive trait of red-green color blindness in humans. The daughter of a woman who is color-blind had normal vision and marries a man who is color-blind. This couple has a son, what is the probability that the son will be color blind?
1/2
What is the probability that the genotype TTSs will be produced by the parents TTSs x TtSS?
1/4
Tongue rolling is completely dominant to non-tongue rolling. A man who is a homozygous tongue roller and his non-tongue rolling wife has a child. What is the percent chance for the child to be a tongue roller?
100%
A pea plant that is heterozygous for round, yellow peas (RrYy) is crossed with a pea plant that is homozygous for round peas but heterozygous for yellow peas (RRYy). How many different phenotypes are their offspring expected to show?
2
How many genetically different gametes are produced by a pea plant with a genotype of RrTT?
2
A widow's peak is dominant to a straight hair line. Two people who are heterozygous for having a widow's peak have offspring. What is the chance that the child will have a straight hair line?
25%
Petunias with red flowers are dominant to petunias with white flowers. The heterozygote is a petunia with pink flowers. Cross two pink petunias. What is the percent chance that the offspring is a petunia with red flowers?
25%
A genetist is studying a fish population and determines that there is one gene for eye color which has two alleles: R and W. She mates a red-eyed fish (RR) with a white-eyed fish (WW), and all of the F1 offspring have pink eyes. She then mates the F1 offspring with each other. What are the expected ratios of the F2 population?
25% RR, 50% RW, and 25% WW
If individual 6 marries a woman with the disease, what is the probability that their first child will have the disease?
50%
Petunias with red flowers are dominant to petunias with white flowers. The heterozygous is a petunia with pink flowers. Cross a red petunia and a pink petunia. What is the percentage that you have red offspring?
50%
A widow's peak is dominant to a straight hair line. Two people who are heterozygous for having a widow's peak have offspring. What is the chance that the child will have a widow's peak?
75%
End of meiosis II
A
If a man with blood type A and a woman with blood type B produce an offspring, what might be the offspring's blood type?
A, B, AB, or O
The principles of genetics formulated by Gregor Mendel applied to what?
All living organisms
What is the most likely mode of inheritance for this disease?
Autosomal recessive
End of mitosis
B
A cross of a black chicken (BB) with a white chicken (WW) produces all speckled offspring (BBWW). This type of inheritance is known as what?
Codominance
What is a mode of inheritance of a trait in which two phenotypes are both expressed fully in a heterozygote?
Codominance
Beginning of meiosis
D
End of meiosis I
E
Why is meiosis necessary?
Haploid gametes are formed through this process which later can combine in sexual reproduction to create a new organism
An individual had two of the same allele is said to be what for that trait?
Homozygous
What did Gregor Mendel conclude that traits are?
Inherited through the passing of "factors" from parents to offspring
If individual 2 were to marry a woman with no family history of disease, what would most likely be true of their children?
None of the children would have the disease
What is the physical appearance resulting from a given gene combination called?
Phenotype
A blue-flowered African violet of unknown ancestry self-pollinated and produced 50 seeds. These seeds germinate and grow into flowering plants. Of these plants, 36 produce blue flowers and 14 produce pink flowers. What is the best explanation for the pink-flowered offspring?
Pink flower color trait is recessive to blue flower color
Human height occurs in a continuous range because it is affected by the interaction of several genes, making it a what?
Polygenic trait
A tall plant is crossed with a short plant. What will happen the F1 pea plants are allowed to self-pollinate?
Some of the offspring will be tall, and some will be short
In the P generation, a tall plant was crossed with a short plant. Why did short plants reappear in the F2 generation?
The allele for shortness and the allele for tallness segregated when the F1 plants produced gametes
When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, why were all the offspring tall?
The allele for tall plants is dominant
Eye color in a particular strain of fly is influenced by one gene with two alleles: a dominant allele that results in red eyes and a recessive allele that results in sepia (reddish-brown) eyes. A red-eyed female from a true-breeding population is mated with a sepia-eyed male. The F1 offspring are all red-eyed. The F1 flies are allowed to interbreed, producing the following in the F2 generation. Females: 40 red eyes; 13 sepia eyes Males: 39 red eyes; 11 sepia eyes What best describes the likely mode of inheritance for the eye-color gene?
The eye-color gene is likely autosomal because males and females have similar phenotype ratios
One of the major contributions of Mendel to the study of genetics was what?
The use of a mathematical approach to analyze data
What are the advantages of using garden peas for Mendel's experiment EXCEPT?
True-breeding varieties were rare
In peas, the trait for tall plants is dominant (T) and the trait for short plants is recessive (t). The trait for yellow seed is dominant (Y) and the trait for green seed color is recessive (y). A cross between two plants results in 296 tall yellow plants and 104 tall green plants. Which of the following are most likely to be the genotypes of the parents?
TtYy x TTYy
