Genetics questions | form four Biology

When red pea plants are crossed with a white flower pea plant , all the F1 generation were pink flowers. This is an example of

• Crossing over
• Mutation
• Incomplete dominance
• Recessiveness
• Inbreeding

Who is an albino?

Explain the problems faced by a person with Albinism under the following guidlines

• Vision
• Exposure to sunlight

Give the genotype of the offspring produced when an Albino male marries a female who is heterozygous for albinism.

Mr and Mrs Masaka, happened to have four children in their marriage. One of them is an albino. What is the possible genotype of Mr and Mrs Masaka.?

• AA X AA
• Aa X aa
• Aa X Aa
• AA X Aa
• aa X aa

Pure breeding tall pea plants are crossed with pure breeading short pea plants. The resulting offspring (F1) are tall. Which term describe the F1 generation?

1. Heterozygous, with shortness dominant
2. Heterozygous, with tallest dominant
3. Homozygous dominant
4. Homozygous recessive
5. Heterozygous, with incomplete dominance

Katundu ia an ex-form four fellow and is blood group B heterozygous. Haambiliki who was to finish form four this year is blood group A heterozygous. She has a son Kaajali of blood group O whom she claims Katundu is the father. Katundu who used to abscond biology classes and know no genetics has has refuted parentage. Give an outline of information that will help Katundu realize that he is the legitimate father of Kaajali.

If a sickle-celled man marries a heterozygous normal woman, the chance that they will produce a sickle-celled child is
A. 25%
B. 50%
C. 75%
D. 100%.

A plant breeder discovered that black colour in bean seeds was expressed in a heterozygous state while white was expressed in a homozygous state only. Write down parental genotypes that could be crossed to give offspring that were

1. all black
2. all white
3. 50% black and 50% white
4. all heterozygous black.

What is a lethal gene?