Most Asians naturally have thick, straight hair due to a genetic variation in the EDAR gene which is associated with hair follicle development in East Asian. Curly hair is present in individuals that are homozygous recessive for that trait.

If hair texture is determined by a single gene, what is the expected genotypic outcome of crossing TWO individual who are heterozygous for straight hair?

A mom with type A blood and a dad with type B blood receive a baby with type O blood. The father claims this cannot be his child.

Based on your knowledge of multiple alleles and blood types, did the parents receive the correct baby? Support your answer with evidence from a Punnett Square.

STEM: _____________ the parents did/did not receive the correct baby, because________________.

A model of the color patterns in rabbits is shown below.

Which Punnett square will produce a 50% spotted and a 50% white coat rabbits?

In cats the allele for a black coat color (B) is dominant over the allele for a white coat color (b).

If a homozygous dominant black cat is crossed with a heterozygous black cat, which of the following genotypic ratios can be expected?

In wasps, stinger shape is controlled by two different alleles. The allele for a pointed stinger is (P) and the allele for round stinger is (p).

When two heterozygous wasps are crossed, what percentage of their offspring is expected to be homozygous for round stinger?

In pigs coat color is determined by codominance. Possible phenotypes and genotypes of coat colors are shown below.

Which table shows the expected phenotypes of offspring resulting from a cross between a brown-white pig and another brown-white pig?

What are the blood types of the possible children that a man with type AB could produce with a woman who is type AB?

Select all that apply

A genetic cross involving two unlinked genes is represented.

GgSS x ggSs

Which genotype is NOT possible in the offspring produced by the cross?

In sea turtles, a ridged shell (R) is dominant over a smooth shell (r), and green colored skin (G) is dominant over brown colored skin (g).

What is the expected phenotypic ratio of the offspring of an RrGg x RrGg cross?

In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b).

If a homozygous recessive brown cocker spaniel is crossed with a heterozygous black cocker spaniel, which of the following genotypic ratios can be expected?

In students, funny is dominant to not funny. Jose is homozygous for funny and Valeria is heterozygous. If Jose and Valeria had kids, what percent of their offspring would NOT be funny?

Cystic fibrosis is considered an "autosomal recessive" genetic disorder (c), meaning that a person must inherit two recessive alleles of a mutated gene (one from each parent) to develop the disease. Not having this condition is dominant (C) to having Cystic Fibrosis (c).

Which circle graph shows the genotype probability when a female with individual with Cystic Fibrosis mates with a male that is homozygous dominant?

In tigers, whiskers length can either be short or long. The allele for long whiskers (L) is dominant to short whiskers (l).

If a female tiger that has short whiskers mates with a male tiger that is homozygous dominant, what percent of their offspring will likely have long whiskers?

Enter your answer in the box. Your answer must be a whole number.

In dogs, having furnishings (F) is dominant to not having furnishing (f). Jose's dog has no furnishings (ff).

The appearance of a recessive trait (no furnishings) in an animal’s offspring most likely means that…

In wolves, black is dominant to white.

What are the expected genotypes of the offspring if a homozygous black wolf mates with a white wolf?

The inheritance pattern for an autosomal recessive trait is shown in the pedigree. Shaded symbols represent individuals that express the recessive (small) trait.

Identify the genotypes for individuals 1 and 2 in the first generation.

In humans, having dimples is dominant to no dimples. Gina is hybrid for having dimples and her husband is heterozygous for the trait.

When a heterozygous dimpled man mates with a heterozygous dimpled woman, what is the expected outcome of their children?

A specific type of retrievers can have a black coat color, a white coat color, or a grey coat color. The allele for a black retriever has a genotype of C^B is incompletely dominant over the allele for a white retriever with a genotype of C^W. So heterozygous retrievers have gray coat color.

Which cross below has the highest probability of producing a gray coat color offspring?

What are the blood types of the possible children that a woman with type O could produce with a man who is type B?

Duchenne muscular dystrophy is a sex-linked trait found only on the X chromosome. Not having this disease is dominant (N) to having this disease (n). A mother who is a carrier for this disease mates with a father that is not affected.

The couple have a daughter. What are the chances she is a carrier for the disorder?

In giraffes, long necks (L) are dominant to short necks (l) and spots (S) are dominant to no spots (s). A heterozygous long neck giraffe without spots mates with a short neck giraffe who is heterozygous for having spots. What would the genotype of an offspring with short necks and no spots?

Tentacle texture and fin shape are inherited traits in squid. Barbed tentacles (B) are dominant over smooth tentacles (b) and flat fins (F) are dominant over curved fins (f). The alleles for smooth tentacles and curved fins are recessive.

If a male who is homozygous for barbed tentacles and heterozygous for flat fins mates with a female who has smooth tentacles and curved fins, what is the probability of having offspring that are heterozygous for both traits?

Cystic fibrosis is an autosomal recessive disorder that impacts the ability of the lungs to remove mucus. The figure shows a family affected by Cystic fibrosis.

What is the probability that Child 1 will have Cystic fibrosis?

What percent of their embryos are expected to survive?