7th Grade Genetics

If a red flower (EE) is crossed with a yellow flower (ee), how many different phenotypes are possible?

In anole lizards, the dominant allele L controls the trait for long tails. The recessive allele l controls the trait for short tails. A female lizard with the genotype LL crosses with a male lizard with the genotype Ll. What phenotype(s) wi

genotype

The Punnett square shows a cross between two pea plants, each with round seeds.  Use the Punnett square to answer question. What is the probability of having an offspring that will produce round seeds? 

The allele for freckles, F, is dominant among humans.  If a woman with freckles (FF) and a man without freckles (ff) have children, what are the possible genotypes of the children?

What is the genotype of a pea that is homozygous recessive for wrinkled peas?Use the chart to answer the question:

gene

phenotype

Use the table to answer the following question: What is the phenotype of a pea that is heterozygous for plant height?

Which of the following best describes what a Punnett square shows?

An orange tiger gives birth to one white tiger and three orange tigers. Which alleles does the mother have for color?

homozygous recessive

A person who is pure (homozygous) for right-handedness has children with a person who is pure (homozygous) for left-handedness. If all of the offspring are right-handed, which trait is most likely dominant?

allele

The Punnett square shows a cross between two pea plants, each with round seeds. Use the Punnett square to answer question. The missing genotype in the square should be correctly written as ___.

The uppercase letter B  represents the dominant allele for black wool in a sheep.  The recessive allele for white wool is represented by the lowercase b.  All the offspring of two sheep are white. What are their genotypes of the offspring?

What is the missing parent genotype?

heterozygous

A cross between two purple pea plants yields approximately 25% of the offspring exhibiting white flowers. If purple-flowered plants are dominant to white, what are the genotypes of the parents?

Use the table to answer the following question: What is the phenotype of a pea that has the genotype RR?

The Punnett square shows the genotypes of two boxwood plants. T represents the allele for the tall trait. The allele for the dwarf trait is represented by t. What are the possible genotypes of the plants’ offspring?

homozygous dominant

Which statement is true about the cross shown in the Punnett square?

What is labeled B?