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Mendel's Crosses
monohybrid, dihybrid, test cross
| Question | Answer |
|---|---|
| Helps predict possible offspring of a cross between two organisms with known genotypes | punnett square |
| What do you call a genetic cross such as the following Aa x Aa | monohybrid cross |
| both of the parents in a monohybrid cross can be described as... | heterozygous for a single trait |
| What letter in the symbol of a genotype goes first in an individual that is called a monohybrid | the capital letter goes first Aa |
| Using Y= yellow and y = green.... give the phenotype ratio for a monohybrid cross | 3/4 should be dominant or yellow and 1/4 should be green or recessive |
| An organism that is hybrid for two traits is called a/an | dihybrid |
| An organism that is heterozygous for one trait is called a/an | monohybrid |
| If Y= yellow and y= green..... and R= round and r = wrinkled...Describe the genotype of a dihybrid | YyRr |
| If Y= yellow and y= green... Describe the parents of a dihybrid cross ( give their genotypes) ____x_____ | YyRr x YyRr |
| If an individual is described as YyRr ... How many letters would be in the individual's gametes | 2 ( YR Yr yR or yr are possible ) |
| What gametes are possible for an individual describe as Aa | It could make big A or little a since meiosis occurs to separate the genes for the parent donates one per trait |
| Using Y= yellow y= green and R= round and r= wrinkled... what do you know if the phenotype ratio turns out to be 9/16 yellow and round 3/16 yellow and wrinkled 3/16 green and round and 1/16 green and wrinkled | The parents are YyRr x YyRr ( a dihybrid cross) |
| Using Y= yellow and y= green... What do you know if the phenotype ratio is 3/4 yellow to 1/4 green | the parents are Yy x Yy ( a monohybrid cross) |
| If Y= yellow y= green and R= round and r= wrinkled if the parents are YyRr x YyRr... what is the expected phenotype ratio | 9/16 yellow round 3/16 yellow wrinkled 3/16 green round and 1/16 green wrinkled |
| If Y= yellow and y= green... If the parents are Yy x Yy what is the expected phenotype ratio | 3/4 yellow 1/4 green |
| If Y= yellow and y= green and R= round and r= wrinkled ... In a cross between YyRr x YyRr , How many are expected to be all recessive green and wrinkled | 1/16 |
| Which one of Mendel's laws was developed while he worked with 2 traits at once | Law of independent assortment |
| The law of independent assortment is similar to another one of Mendel's laws but deals with two traits | Law of segregation ( assortment means about the same thing as segregation) |
| The law of independent assortment has been modified to state that it only works ... | if the genes are on separate chromosomes |
| State the Law of Independent Assortment | Genes for two traits segregate into gametes without bothering each other if they are on separate chromosomes... in YyRr the Y can go with the R or the r the y can go with the R or y.... For two traits each gamete would have two genes..one / trait) |
Created by:
shemehl
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