Genetics

What is the chance of two parents with blood types AB and O producing an offspring with blood type O?

0%

In humans, free earlobes are dominant to attached earlobes. If a homozygous dominant male has children with a homozygous recessive female, what percent of their children can be expected to have free earlobes?

100%

In a certain species of rabbits, black coat color is dominant over brown coat color. What is the probability of producing a rabbit with brown coat color from two rabbits that are both heterozygous with black coat color?

25%

A red flower (RR) and a white flower (R'R') are crossed and produce pink flower offspring (RR'). What is the expected outcome for the offspring that result from the cross between two pink flower plants?

25% red, 50% pink, 25% white

The dominant trait for height in a particular plant is tall (T), and the recessive trait is short (t). If both parents are heterozygous for height (Tt), which ratio of offspring will the parents produce based on Mendel's law of segregation?

3 tall : 1 short

A mother is heterozygous for blood type A and a father has blood type AB. What is the probability that their offspring would have type A blood?

50%

In guinea pigs, the allele for rough coat (R) is dominant to the allele for smooth coat (r). A heterozygous guinea pig is crossed with a homozygous recessive guinea pig. What percentage of offspring will be homozygous recessive?

50%

The ABO blood group has three different alleles: IA, IB, and i. The genotypes and phenotypes (blood types) for different combinations of the three alleles are shown in the table. Genotypes Phenotypes -IAIA or IAi -Type A -IBIB or IBi -Type B -ii -Type O -IAIB -Type AB ~What percentage of offspring from a cross between a homozygous Type A parent with a heterozygous Type A parent is expected to contain the i allele?

50%

A student wants to cross parent mice to produce offspring with black fur and offspring with white fur. If black fur color (B) is dominant to white fur (b), what should be the genotypes of the parent mice?

Bb and Bb

Alex has blue eyes, and both of his parents have brown eyes. What can most likely be concluded about Alex's parents?

Both of his parents have recessive blue eye characteristics.

A man and his wife both have widow's peaks. Their baby has a continuous hairline. Which best explains how this could happen? A Both parents have heterozygous genotypes. B Both parents have homozygous dominant genotypes. C One parent is homozygous dominant, and the other is heterozygous. D One parent is homozygous dominant, and the other is homozygous recessive.

Both parents have heterozygous phenotypes

Which best describes polygenic traits? A traits that are always dominant to other traits B traits that are always masked by any other traits C traits that skip generations and appear in the offspring of later generations D traits that are determined by a combined effect of more than one pair of genes

D traits that are determined by a combined effect of more than one pair of genes

Which cross could produce a child with type O (ii) blood?

IAi x ii

Which pattern of heredity determines human hair color and skin color? A multiple alleles B polygenic inheritance C incomplete dominance D sex-linked inheritance

Polygenic inheritance

Two heterozygous tall plants (Tt) are crossed. What are the expected genotypes and percentages of this cross?

TT 25%; Tt 50%; tt 25%

Gregor Mendel cross-pollinated red and white snapdragon flowers. What information indicates that incomplete dominance was achieved?

The offspring were pink.

A girl inherited the dominant trait of dimples but her sister did not because both parents had different

alleles for dimples.

What biological concept was Mendel studying when he crossed pea plants many times over many generations?

dominant and recessive traits

Sickle cell anemia is a condition that affects the shape of a red blood cell. An unaffected individual can be represented with the genotype AA. An affected individual can be represented with the genotype SS. Individuals that are carriers have the genotype AS. Which is the BEST description of sickle cell anemia? A multiple alleles B incomplete dominance C homozygous recessive D heterozygous dominant

incomplete dominance

What type of inheritance controls blood types in humans?

multiple alleles

What information can be revealed by a Punnett square?

potential genotypes and phenotypes of offspring