In peas, the gene for yellow color (C) is dominant to the gene for green color (c). To determine the genotype of an unknown yellow pea, what kind of pea should you cross with it?
Correct answer: D. Homozygous recessive (cc)
- A. Another unknown green pea
- B. Any genotype
- C. Homozygous dominant
- D. Homozygous recessive (cc)
Explanation
A green pea would definitely be homozygous recessive. A is the best option because if the unknown dominant individual is heterozygous, then the offspring of this year's cross will include some recessive individuals. If the unknown is homozygous, then all offspring will be dominant heterozygous. In this way, crossing an unknown dominant phenotype with a recessive individual is the surest way of determining the unknown genotype.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
Practise Inheritance
1,238 free Inheritance MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Inheritance questions
Which of the following is the most suitable term for the genotype AaBb?
When hybrids are crossed, the genotype ratio of the offspring is
In our society women are blamed for producing female children. Choose the correct answer for the sex determination in humans.
Blood group AB can be donated to:
The following results of a cross between two individuals shown in the picture are: Which statement describes the children of the cross?
The "d" and "D" alleles are used for lighter and darker skin colour in humans, respectively. By keeping in view the inheritance pattern of skin colour in human beings(controlled by 3 genes), choose which combination shows medium skin colour from the following picture: