The Roman nose shape has a distinctive rounded shape as shown in comparison to a straight nose shape below.
If two heterozygous parents produce offspring, what would be their expected genotypic ratio for their offspring?
Cystic fibrosis is an X linked disease where XN are healthy and Xn have Cystic fibrosis.
A woman who is a carrier (heterozygous) for Cystic Fibrosis mates with a man who has Cystic Fibrosis, a recessive disease.
What percentage of their offspring will be carriers for the disease?
In a group of cats, some individuals have tightly curled fur, some have wavy fur, and some have straight fur. In this group, one of the genes for follicle shape has two alleles. The allele for curved follicles resulting in tightly curled fur (KR) is incompletely dominant over the allele for straight follicles resulting in straight fur (KS). So heterozygotes have wavy fur.
Determine which of the following Punnett squares show a cross between two cats who both have wavy fur.
In a group of eggplants, some plants have green fruit, some have white fruit, and some have light-green fruit. Fruit color is dependent on chlorophyll production.
The allele for chlorophyll production that results in green fruit (CG) is incompletely dominant over the allele for no production that results in white fruit (CW). Heterozygotes have light-green fruit.
A homozygous green fruit and light-green fruit are crossed. Complete the sentences below for the predicted outcome of offspring produced.
The green fruit genotype is and light green fruit genotype is .
When these two fruits are crossed, of the eggplants will be green and will be light-green.
The Cyanocitta cristata is a bird more commonly known as the blue jay. This bird is native to North America and their common name comes from the bold color observed in their feathers as shown below.
Blue jays with the genotype CBCB have blue feathers. Those with the genotype CGCG have gray feathers. Others with the genotype CBCG have a combination of blue and gray in their feathers.
Based on the information about blue jay feathers, which statement below is true?
A species of river fish have scales that appear blue or brown in color.
A solid blue fish has a genotype of CACA while a solid brown fish has a genotype of CCCC. Heterozygous fish appear to have both blue and brown scales.
When a blue fish mates with a heterozygous fish, what is the expected ratio of the resulting offspring?
There are multiple alleles for the ABO blood group. Why are only two alleles present in any one individual?
A model of the color patterns in zebrafish is shown below.
Which Punnett square represents a cross that would produce Nacre offspring?
In humans, hemophilia is a sex linked trait. Females can be normal (XHXH), carriers (XHXh), or have the disease (XhXh). Males either have the disease (XhY) or they do not (XHY).
Of the choices below, which cross produces female carriers of hemophilia?
In fruit flies, eye color is a sex linked trait in which red (XR) is dominant to white (Xr). A red eyed female (XRXR) mates with a white eyed male (XrY) shown in the cross below.
Based on the Punnett square for the sex linked trait, of males will have red eyes and of males will have white eyes.
Use the "edit background" feature to show the possible crosses of Charlie and the mother.
The judge ruled in favor of the mother, and Charlie Chaplin had to pay child support for 18 years. Was the judge correct in his decision based on blood typing evidence? Use your Punnett squares from the previous question to support your answer.
In mice, a dominant allele (Y) causes yellow fur, while the recessive allele (y) causes gray fur. However, the homozygous dominant genotype (YY) is lethal, and embryos with this genotype do not survive. A yellow-furred mouse (Yy) is crossed with another yellow-furred mouse (Yy).
What is the phenotypic ratio of the surviving mice from the cross above?
