List four types of stem cells
2 answers:
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Answer:
1 DDRR - Red, non-dexter
2 DDRr - Roan, non-dexter
2 DdRR - Red, dexter
4 DdRr - Roan, dexter
1 DDrr - white, non-dexter
2 Ddrr - white, dexter
Explanation:
Dexter is deleterious in homozygous condition, hence, phenotypes are heterozygous.
Roan are also heterozygous.
If dexter allele is represented by D, non dexter individuals will be DD dexter individuals will have the genotype Dd.
If colour in cattle is represented by R, red individuals will be RR, white will be rr, then roan colour will be Rr.
Hence, roan dexter cow and roan dexter bull will both have DdRr genotypes.
Crossing the two: DdRr x DdRr
Progeny:
1 DDRR - Red, non-dexter
2 DDRr - Roan, non-dexter
2 DdRR - Red, dexter
4 DdRr - Roan, dexter
1 DDrr - white, non-dexter
2 Ddrr - white, dexter
<em>Others that are either aborted or stillbirths include:</em>
<em>1 ddRR </em>
<em>2 ddRr </em>
<em>1 ddrr</em>
