Dominant vs. Recessive Traits
Q: A recessive trait can only appear when an organism has this type of genotype?
A: What is homozygous recessive?
Q: What is the purpose of a Punnet Square?
A: What is to predict possible offspring genotypes and phenotypes.
Q: The chance of throwing a 4-sided die is this percent.
A: What is 25%
Q: This term describes the physical appearance of an organism.
A: What is phenotype.
Q: Gregor Mendel is known as the "Father of Genetics" because of experiments done on these specific plants.
A: What are pea plants.
Q: In guinea pigs, black fur (B) is dominant over white fur (b). What is the phenotype of Bb?
A: What is black fur?
Q: What is the genotype ratio for a Tt Tt cross?
A: What is 1 TT : 2 Tt : 1 tt
Q: The probability of rolling an even number on a six-sided die in this fraction.
A: What is ½?
Q: This genotype contains two different alleles for a trait.
A: What is heterozygous?
Q: Mendel finalized that traits are passed from parents to offspring through discrete "factors", that are now called these.
A: What are genes?
Q: Two parents both show a dominant trait but have a child with a recessive trait. What has to be true about the parents?
A: What is they are both heterozygous.
Q: In a Cc Cc cross, what percentage of offspring will show the dominant trait?
A: What is a percentage of 75%
Q: Two heterozygous parents have a child. What is the probability the child will show the dominant trait?
A: What is 75%
Q: An organism with genotype Aa shows the dominant trait. The recessive allele is described as this because it's not expressed.
A: What is masked?
Q: This Mendelian law states that allele pairs separate during gamete formation.
A: What is the Law of Segregation?
Q: A woman is heterozygous for dimples (Dd), and her husband has no dimples (dd). What is the probability that their child will have dimples?
A: What is probability of 50%
Q: A homozygous dominant plant is crossed with a homozygous recessive plant. What is the percentage of the offspring that will be heterozygous?
A: What is a percentage of 100%
Q: Two heterozygous parents (Aa Aa) have four children. What is the probability all four children will show the recessive trait?
A: What is (¼)^4 = 1/256
Q: An individual with genotype RR has this classification.
A: What is homozygous dominant?
Q: This principle states that genes for different traits separate independently during gamete formation.
Q: Huntington’s disease is caused by a dominant allele. Why can the disorder continue through generations even if it is harmful?
A: What is people may reproduce before symptoms appear.
Q: Two heterozygous tall pea plants (Tt Tt) produces 16 offspring. How many will be short?
A: What is four of the offspring will be short.
Q: Two parents are both heterozygous for a recessive trait (Tt x Tt). What is the probability their child will show the recessive phenotype?
A: What is 25%
Q: A researcher crosses two unknown organisms that show dominant phenotypes. Some offspring display the recessive phenotype. What has to be true about both of the parents?
What is both parents have to be heterozygous?
Q: Mendel's work was ignored for a while because scientists at that time didn't understand this cellular process involving chromosomes.
A: What is meiosis?