7. Which of the following is NOT a direct source of genetie variation of unrelat

Question

7. Which of the following is NOT a direct source of genetie variation of unrelated gametes (sex) mutation 8. Match the word on the left with its definition (1 pts each) Linkage A. More than two phenotypes associated with sirgin geno A single gene that affects many traits C A phenotype infuenced by external factors D. Having two different alleles of a gene E. A gene whose presence hides another F A gene whose presence is hidden by another G. Two alleles that create an intermediate phenotype when together H. Many genes involved in creating a trait Dominant Recessive Homozygous Sex Linkage Allele Polymorphism - Polygenic Incomplete dominance H Two genes on the same c Environmental interaction When two different alleles are expressed simultaneousiy A version of a gene A gene located on the X or Y chromosome 8. (12 pts) Complete the Punnett square and analysis for the following dihybrid cross: RrYY x RrYy where R= Round seeds, r wrinkled seeds, Y=Yellow seeds, and yagreen seeds

Explanation / Answer

7. not a direct source of genetic variation – mitosis (option c)

Crossing over results in exchange of chromosomal segments.

Change in DNA sequence directly leads to variation.

Union of unrelated gametes in necessary for genetic variation. Mutation itself is a genetic variation.

A normal mitosis cannot be a source of genetic variation.

8.

Linkage- two genes on the same chromosome

Codominance-when two different alleles are expressed simultaneously

Pleiotropy- a single gene that affects many traits

Dominant-a gene whose presence hides the other

Recessive- a gene whose presence is hidden by another

Homozygous- having two same alleles of a gene

Heterozygous- having two different alleles of a gene

Sex linkage- a gene located on the X or Y chromosome

Allele- a version of a gene

Polymorphism- more than two phenotypes associated with a single gene

Polygenic- many genes involved in creating a trait

Incomplete dominance- two alleles that create an intermediate phenotype when together

Environmental interaction- a phenotype influenced by external factors

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