Part A. Dihybrid Genetic Problems As discussed in Exercise II, dihybrid crosses involve the inheritance of two different traits and therefore two sets of alleles. We can determine the genotypes of the offspring of a dihybrid cross by using a Punnett square. The first step in solving this kind of problem is to determine the number of different kinds of gametes produced by each parent. Mendel's principles of segregation and independent assortment are both invoked in the identification of the genetic composition of the gametes. The results of the Punnett square can be most easily interpreted if the alleles are recorded in a consistent order. Both alleles governing a given characteristic should always be written side by side and the dominant allele in heterozygous individuals should always be recorded in the first position. The example given here will illustrate a procedure for you to follow in working subsequent problems. A homozygous tall, red-fruited tomato plant is pollinated by a homozygous dwarf, yellow- fruited plant. The parental genotypes are DDRR (female) and ddrr (male). 26. What alleles will be carried by the eggs? By the sperm? 27. What are the possible genotypes of the progeny?. The phenotypes the progeny? The Punnett square for this cross would appear as follows: Parents: DDRR x ddrr Punnett square: DR dr DdRr neig - SE Isarton Hew SED 201 eri v zadie 16dW The resulting F1 plants have the genotype DdRr. These F1 plants are now self-pollinated. 28. What possible combinations of alleles will be carried by the sperm from the F₁ plants? By the eggs?
Part A. Dihybrid Genetic Problems As discussed in Exercise II, dihybrid crosses involve the inheritance of two different traits and therefore two sets of alleles. We can determine the genotypes of the offspring of a dihybrid cross by using a Punnett square. The first step in solving this kind of problem is to determine the number of different kinds of gametes produced by each parent. Mendel's principles of segregation and independent assortment are both invoked in the identification of the genetic composition of the gametes. The results of the Punnett square can be most easily interpreted if the alleles are recorded in a consistent order. Both alleles governing a given characteristic should always be written side by side and the dominant allele in heterozygous individuals should always be recorded in the first position. The example given here will illustrate a procedure for you to follow in working subsequent problems. A homozygous tall, red-fruited tomato plant is pollinated by a homozygous dwarf, yellow- fruited plant. The parental genotypes are DDRR (female) and ddrr (male). 26. What alleles will be carried by the eggs? By the sperm? 27. What are the possible genotypes of the progeny?. The phenotypes the progeny? The Punnett square for this cross would appear as follows: Parents: DDRR x ddrr Punnett square: DR dr DdRr neig - SE Isarton Hew SED 201 eri v zadie 16dW The resulting F1 plants have the genotype DdRr. These F1 plants are now self-pollinated. 28. What possible combinations of alleles will be carried by the sperm from the F₁ plants? By the eggs?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Transcribed Image Text:Now cross two of the F₁ offspring.
Parent 1
Gametes
F2 Offspring
Parent 2
Gametes
24. What is the phenotypic ratio in the F2 generation?
25. In the dihybrid cross you have considered two traits at a time. Although the number of
traits has increased by one, what has happened to the number of possible phenotypes of
offspring produced in the F2 generation?
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Transcribed Image Text:Part A. Dihybrid Genetic Problems
As discussed in Exercise II, dihybrid crosses involve the inheritance of two different traits
and therefore two sets of alleles. We can determine the genotypes of the offspring of a dihybrid
cross by using a Punnett square. The first step in solving this kind of problem is to determine the
number of different kinds of gametes produced by each parent. Mendel's principles of
segregation and independent assortment are both invoked in the identification of the genetic
composition of the gametes.
The results of the Punnett square can be most easily interpreted if the alleles are recorded
in a consistent order. Both alleles governing a given characteristic should always be written side
by side and the dominant allele in heterozygous individuals should always be recorded in the
first position. The example given here will illustrate a procedure for you to follow in working
subsequent problems.
A homozygous tall, red-fruited tomato plant is pollinated by a homozygous dwarf, yellow-
fruited plant. The parental genotypes are DDRR (female) and ddrr (male).
26. What alleles will be carried by the eggs?
endos By the sperm?
27. What are the possible genotypes of the progeny?
The phenotypes the progeny?
The Punnett square for this cross would appear as follows:
Parents: DDRR x ddrr
Punnett square:
Parents:
DR
X
dr
DdRr
2 93 liw celalls 1sdW.EE
SD 200 it low
W
The resulting F1 plants have the genotype DdRr. These F1 plants are now self-pollinated.
28. What possible combinations of alleles will be carried by the sperm from the F₁
plants?
By the eggs?.
Complete the Punnett square below and write in the genotypes of the parents in the spaces
provided. The parents are the F1 plants.
69
A d
- SE
Ismion\hswü
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