7. When a pea plant of genotype Aa Bb produces gametes what proportion will be a
ID: 7288 • Letter: 7
Question
7. When a pea plant of genotype Aa Bb produces gametes what proportion will be ab?8. Hamsters are long haired if they have the genotype LL or Ll and they are short haired if they have the genotype ll. A long haired hamster is mated with a short haired hamster. Half of the offspring are long haired and half are short haired. This allows us to conclude that the long haired parent hamster is? D
9. In peas yellow seed (Y) is dominant over green seeds (y) and tall plant (T) is dominant over short plant (t) .Calculate the probability of the genotypes and phenotypes. in the F2 generation of a dihybrid cross that begins when a dominant homozygote is crossed with a recessive homozygote. You must show the all of the probability calculations. D
10. In a fruit fly experiment, two gray-bodied fruit flies produce mostly gray-bodied offspring, but some of the offspring have black bodies. If there are 280 offspring, how many will you predict will have grey bodies and how many will have black bodies? How many of the 280 offspring do you predict will be heterozygous? Show your work. D
11. In a dihybrid cross AaBb X AaBb what fraction of the offspring would be D
i) homozygous for both recessive traits
ii) heterozygous for both traits
ii) homozygous for both traits
Explanation / Answer
7. When a pea plant of genotype Aa Bb produces gametes what proportion will be ab?
the games can be AB, Ab, aB, or ab. so 1/4 of the time
8. Hamsters are long haired if they have the genotype LL or Ll and they are short haired if they have the genotype ll. A long haired hamster is mated with a short haired hamster. Half of the offspring are long haired and half are short haired. This allows us to conclude that the long haired parent hamster is? D
the long haired parent is Ll because if he was LL all of the off spring would have long hair, he can only pass on the L allele for long hair.
9. In peas yellow seed (Y) is dominant over green seeds (y) and tall plant (T) is dominant over short plant (t) .Calculate the probability of the genotypes and phenotypes. in the F2 generation of a dihybrid cross that begins when a dominant homozygote is crossed with a recessive homozygote. You must show the all of the probability calculations. D
YYTT is crossed with a yytt.
and the f1 generation is all YyTt
the f2 generation is 9:3:3:1: 9 Y_T_, 3:Y_tt, 3:yyT_,1yytt.
the underline means that it could either be dominant or recessive allele.
10. In a fruit fly experiment, two gray-bodied fruit flies produce mostly gray-bodied offspring, but some of the offspring have black bodies. If there are 280 offspring, how many will you predict will have grey bodies and how many will have black bodies? How many of the 280 offspring do you predict will be heterozygous? Show your work. D
1/4 will have black bodies
3/4 will have grey bodies
1/2 of all the progeny will be heterozygous
11. In a dihybrid cross AaBb X AaBb what fraction of the offspring would be D
i) homozygous for both recessive traits 1/16
ii) heterozygous for both traits 14/16
ii) homozygous for both traits 1/16
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